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if the check engine light is on go to auto zone (or some other places) they will read the codes for free. my guess if your car has over 60000 miles or so that you have another coil out (yes these cars have either 6 or 8 coils one for each cylinder) check which coil was replaced (ie cylinder number). the code will usaly say something like cylinder x missing detected. if no code or no light you might have to wait until the problem continues until the puter sences the problem. i have replaced all of my coils by 90k miles. cheers If the valve cover gaskets are leaking oil down onto the coils and plugs, this can cause the coil(s) to fail and the plug/cylinder will misfire and make the car run weak and rough. My 2001 Base V8 is in the shop now for a valve cover gasket replacement job, 75000 miles.

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โˆ™ 2006-09-13 23:21:29
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Q: What else may cause engine to miss especially when trying to hold speed up hills on an LS 2000 have already had a tune up one coil on plug replaced new catalytic converter Still missing?
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Check to see if catalytic converter is stopped up,a clogged fuel filter can cause it to go bad .

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have you replaced the fuel filter yet? a dirty filter will flow less fuel under load causing a loss of power.

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