misfires help
P0300-random misfire
P0301-cylinder 1 misfire P0302-cylinder 2 misfire P0303-cylinder 3 misfire P0304-cylinder 4 misfire P1399-misfire in any cylinder I've tried figuring this out myself and doing research but still no luck getting rid of them. It's my first car so I don't have much experience. So far all I've done/learned is how to clean the IACV valve, replace the intake manifold gasket, change distributer, replace bushings with energy suspension bushings, replace catalytic converter and other simple tasks/maintenance. It's a completely stock ls motor, if anyone could suggest anything I would really appreciate it, thanks. |
Missfire on all four usually points to a fuel supply issue.
Check fuel rail pressure. may have a weak pump. |
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