The car idles fine, and it drives down the road fine, but when I try to accelerate, it surges, pops, backfires and lurches hard. If I floor it it gets worse, even if I shift down for a lower gear. It takes a long time at full throttle to get the car up to the speed limit and it feels like something is going to break with the motor slamming around like it does, but once I make the speed limit the car will run fine. What is this thing doing? It seems to clear when it warms up or drys out, not sure which.
I have a 1987 Fiero, 4 cylinder 5 speed. With an 88 engine.