98 Cvpi

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

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.