My girlfriend's '92 Escort (engine is a '91 1.9L with about 150k)
exhibits some strange behavior after driving for about 15 minutes or more.
It idles and accelerates fine for a while and then there is an almost
complete power loss, but the car never actually stalls. It just gets worse
and worse until you can barely keep it going 5 mph. It kind of chugs and
jerks and will sometimes backfire if you give it a lot of gas. It will
continue to do this indefinitely, but if you shut the car off just for a
second, it will start right back up and run perfectly for another 15 minutes
or so and then do it again. We replaced the fuel pump a while ago and
measured good fuel pressure and the car is not throwing any codes. I'm just
guessing that the problem is something electronic since shutting the car off
sort of "resets" the problem for a short time.
Any ideas on where I should start?