1995 S-10 Four Cylinder Engine misfires (170000 miles)
Starting the cold engine - no problem; driving the initial five miles, even when accelerating hard - no problem; thereafter when going a near constant speed - no problem; but when accelerating from, say 50 to 60 mph - PROBLEM. This acceleration causes what I think is a misfire (after engine is at operating temperature?), sort of a tiny lurch felt every second or two. At first I thought it was water in newly filled tank of gas. So I added a bottle of 'dewaterer' and a bottle of fuel ejector cleaner bought at auto parts store. No change. Eventually used up the gas and refilled. "Misfire' Problem not solved. What is problem and what do I do?