I have a well cared for '88 240. Driving at highway speed the other day and out of nowhere the car had a muffled backfire in the exhaust. This happened several times and the car lost power and felt like it was barely running. Speed dropped from about 75 to 45. I fluttered the pedal to keep it running and suddenly it got power back and got back up to 75. I got off at my exit and it stalled out at a stop sign. Started back up and drove maybe a quarter mile and stalled again. Then it would not restart. After about 3 or 4 minutes I tried again and made another half mile or so. Few minutes rest and I was able to get safely into a parking lot. Didn't touch the car a couple days and then yesterday got it warmed up and drove around 3 or 4 miles at top speed of 40 mph, no issues. What could possible be ailing this car?
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