98 Cvpi

[demaleon]

running rough like a mis, replace spark plugs and still.
check eng ligth off no codes. also blower motor switch
only works on fan high speed.need help!
thanks

[way2old]

Blower resistor will cure the fan problem. An engine miss will not necessarily set the check engine light. You need to have a scanner that will read each cylinder for an engine miss. If you have a scanner that has the mode$06 data, it will pinpoint the exact cylinder that has been missing. Look closely at the coil boots to see if there is indication of a spark burning through the rubber boot. You can also unplug each injector or coil one at a time until there is no change in the running of the engine. That is the cylinder that has tha problem.