On startup without accelleration the engine revs up to around 3000rpm, it than drops to 1000rpm and continuously revs up and down between that range. Even whild cruising steady the engine suddenly picks up speed for a few seconds before dropping off immediately, causing the vehicle to surge forward and die off within a few meters. The engine however, doesn't switch off at all throughout, except when I choose to switch it off.
I had the same problem with my pevgeot. its the rev counter getting stuck on and/or sticking xx
SOURCE: Surging idle speed
check your high idle valve may need to be replaced.situated at the side of throttle body.
good luck
cyril
SOURCE: 1987 F 150 Problem: engine idle stalling and then surges
I had the same symptoms on my 1993 F-150. A friend of mine commented that he could smell gas in the exhaust. Eventually, it got to where it would start, then die after a few minutes and wouldn't restart after that (at least for several hours). It turned out to be a bad fuel pressure regulator that was causing it to flood. It was about a $25 part and an hour labor to replace (not difficult, just awkward getting to the hex head bolts).
SOURCE: Idling to a stall or idling up to 3000rpm the lurches hard
i have the same car it was doing the same i change the mass air flow sensor now run like a brand new car but cost me arround 400$ but to make sure just buy the spray can to clean it you'l se if it run better or go for a scan in a car chop,I hope this gonna help you!...se ya!Patrick give me some news...
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