assassinz28

iTrader: (10)

Hello again I am having a lot of problems with my car its misfiring alot here is all I done to check what is wrong we cheked or replaced the plugs, coils, intake gaskets, new cats, wires, compression throltle position sensor. and every thing its fine and at the dealer they keep telling me its misfiring in cylinder 5 and 7 so I need your help do you think its the Iddeling air control valve or the crank position sensor or what elso do you think it may be please help. The car when I am at a stop light the rpms go down very low and when i am driving in the freeway I feel it like all the sudden losing power than pick up please help I would appreciate it thanks.

Cal

iTrader: (1)

I assume the engine is stock, no mods? Any codes or lights? May be fuel pump or bad gas.

BrentB@TEA

do a leak down test on number 7 cylinder. they have been known to hurt pistons in that cylinder.

assassinz28

iTrader: (10)

no mods the codes that gives is random cylinder misfire

BrentB@TEA

is it a stick shift? Check your pushrods. If you have some bent you may have bent valves also.
Most important do a leak down.
You have to have ,spark,fuel and compression to fire. If one of these is lacking you will have no fire or misfires if it is just lacking a little.