'98 E150 misfire
Looking for suggestions regarding 1998 E150 4.2L V6 misfire. Van has 195,000 miles on it. The only code I get, or ever got, and still get, is P0304. So, I replaced the coil pack and the #4 injector. I swapped the plug wire with another one and there was no change. Compression is fine. The engine starts and idles fine, and is fine at highway speed. The misfire only seems to happen when accelerating from a stop, briefly, also when you take your foot off the gas at a good speed and use the engine drag to decelerate, it is the worst when just cruising around local streets at about 35-40 mph, when the engine is at a low RPM and a higher gear.
Last edited by wnspecht; 04-08-2013 at 08:29.
Reason: Wrong idea.