trailblazer 4.2 cyl 1 misfire Help pls

2004 CHEVROLET TRAILBLAZER
198,000 MILES
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I have a 2004 chevy trailblazer with 4.2 6 cyl i have changed plugs and coil packs run inj cleaner changed map sensor and still running rough i cleaned throttle body cleaned pcv hose i also checked to be sure coils was aligned and down tight still idles at 500 and turn ac on goes between 3&400 pls help lol not sure wat to do from here
Jul 29, 2012 at 10:50 PM
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MERLIN2021
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First you need to solve #1 misfire check compression and fuel injector at #1 the. If problem is neither of those post all stored.codes here. Iac ( idle air control).coyld be ng.
Jul 30, 2012 at 3:55 AM
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Comp good and checked injector wiped all codes out and drove a few miles till ck eng light was flashing only code was p301 misfire on cyl 1 no other codes and still running rough
Aug 3, 2012 at 6:34 PM
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