I changed out spark plugs; rotor cap; rotor; wires; ignition coil; mass air flow senor; Air temperature senor; engine cooling temperature senor; map senor; replace fuel filter; PVC; clean thottle body; check for vacuum leaks. Clear engine code and started engine. Engine starts with no problem runs a little rough not much after engine runs for about five minutes check engine light comes on. Check code same P0300 Random misfire. Now what’s the problem please help. This 1998 GMC Chevy S-10 4.3 liter 6 cylinder 2wd
CODE: P0300 Random misfire on 1998 Chevrolet S10
by cryogenics in Friendswood, TX on April 08, 2009
ANSWER by Russ , April 08, 2009
It may be time for a compression test. You could have a weak cylinder causing a slight misfire at idle.
ANSWER by Visitor , November 14, 2010
for a random multiple misfire you should try dropping the exhaust to see if the car runs any better cause a stopped up converter can cause random multiple misfires even make the car not run at all.