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2004 suzuki forenza error code P0300. rough idle, stumbles on acceleration, then surges, worse when car warms up

2004 suzuki forenza with error code p0300 has rough idle, hesitates on acceleration, stumbles then surges throughout driving range gets worse as car warms up. Replaced plugs and plug wires, performed compression check, it was good. Has been doing this for a while but now its gotten worse.Car is now undriveable. Dont want to waste anymore money throwing parts at it that dont help.
asked Jul 29, 2011 by anonymous

1 Answer

on failure codes p0300 random misfires, the cause of those are many. first to consider is weak secondary spark plug voltage, ie. coil,spark plug cable, spark plug. if vehicle has not had a tune-up done. then consider a complete tune-up replacing spark plugs and spark plug wires first.the other to consideer is fuel injector maintenance, also if it hasn't been done in a while could be cause of problem. fuel injector cleaner "TECHRON" chevron brand works best from my past experiences, also direct fuel injector cleaning by a fuel injector cleaning machine works, last and very hard to find would be an intake manifold lleak, this would be found esier using a stetoscope with a small funnel at the end so you can hear the vacuum leak a lot easier, don't forget to check all the vacuum hoses too.
answered May 21, 2012 by JULIUSCEASAR (102 points)
clean egr or replace it. happened to my brother-in-laws civic. same code. $4 can of carb cleaner to clean egr. runs like a champ. if that doesn't work replace egr valve. ive seen this problem a few times, Lincoln, civic, forenza. the egr valve code might not show up but with throw other codes to make you think something else is wrong.

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