I have a 86 wagon with some kind of electrical problem. Im a moment of panic i removed the battery while the car was running. After i did this the wipers went nuts and the car died. After reconnectig the battery all the exterior lights and the low beams blew. The car started up right after, like nothing happened, but that was not the end of my troubles. I put the car in reverse and hit the gas, stalled. So here is my problem, the 245 will start and idle for a few minutes then stall. If I push the gas and start it i can rev through the tach but as soon as i let off the gas, stall. The car will idle and rev, but i can not get it to go from idle to rev without stalling, thus I can not drive my rig. Replace the alternator and still nothing. Maybe a 40 cal. HydroShock will fix it, but maybe not. PLEASE HELP, my rig needs you.

I guess I could believe that you fried the AMM.
The computers, both the FI ECU and the ignition computer in the RF fender, are virtually indestructible. They rarely die and therefore are always real cheap. I've got an ignition unit from a 1987 if you can't find one anywhere. They're always on Ebay. Match up the numbers on the ID tags on yours.
The last 3 digits are usually what's important.

The AMM you *may* need is the 007 unit. These are a point of failure on 85-88 cars. Check first that the connections to it have good tight pins and no corrosion. This alone can cause such a problem.

Also check the grey plug under or next to the coil- it's 2 pins with a blue and a white/red wire in it. Unplug, check socket contacts, tighten up if necessary, snap back together TIGHTLY.

Check the charging voltage. Should be 13.2-14.5 volts.
Good luck.
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Rob Bareiss, New London CT ::: '87 244DL/M47- 225K, 88 744GLE- 209K, 91 244 183K. Also responsible for the care and feeding of: 88 745GLE, 229K, 88 244GL, 146K, 87 244DL, 235K, 88 245DL, 236K

It could be a fried Air Mass Meter. With the engine off, disconnect the AMM, then start the engine. If it is running pretty much the same as before, the AMM is a strong suspect. If you can find a used AMM to swap in, you can try that and see how it runs then. When the AMM went out in my '88 240 with the same LH system as yours, it had very similar symptoms. It would start but stall when I tried to go. If I was very careful, I could get the car to move but had very little power. This was that limp home mode they talk about and it would take forever to get home in that mode!

Sorry, but when you disconnect the battery, you probably fried at least some electronic components -- unfortunately, your '86 has more of them than older cars.
Your poor running is probably because you're running on "limp-home" mode of your damaged electronic fuel injection system.
The battery serves to absorb and "moderate" the output of the alternator, as well as provide feedback (through the alternator's field input) to control the voltage output of the alternator. When the battery was disconnected ... all hell broke loose, and you probably had as much as 40 or more volts in your car's wiring, enough to cook IC chips and flow bulb filaments of anything that was connected at the time of the incident.
In addition, you've probably also cooked the diodes of your alternator, so that might have to be replaced, too.
Years ago, you could disconnect a car battery because there were only "electrical" parts that could tolerate such voltage surges and spikes, but with "electronic" parts that have a maximum allowable voltage in cars nowadays, those days are long gone.
Sorry, but the most you can hope for is that the casualties are limited to just a few components, those that were operating during the incident -- but that probably includes a lot of expensive stuff, just to keep the engine running.

Never had this happen BUT with the battery disconnected and the vehicle running, there is no load on the alternator, this could send it into a high voltage state. you could have popped you ECU (Computer).

Wait for more Brickboard input before cocking that rifle.
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'75 Jeep CJ5 345Hp ChevyPwr and two motorcycles: it wasn't Volvos safety , it was Longevity that sold me