My '91 240 DL started to run rough last week. The car has 121K miles on it. I had just had it into the shop to have an oil change, new gas and air filter and new pcv (?) valve (firetrap valve? I dunno). When I got it back after a couple of days the car ran very rough, I thought it had water in the gas. I tried a bottle of "gas dryer" over the weekend and thought it helped but yesterday on the way to work it was v bad and this morning even worse. So I turned around, went home, installed a new distributor cap and 3 sparkplugs (could not remove/replace the rear one with the funky tool I was using). Now it seems like the problem is solved. Car runs smoothly and no roughness! I'm wondering could it really be this easy? My guess is that it was the new distributor cap. I'm betting also if I'd taken this into a shop I would have easily spent $250 on "mechanic recommended" repairs. Yes I know at 120K there are some service items I need to attend to but thats a different topic.
Opinions anyone?
Markus
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