Title says it all. Misses while giving light to moderate throttle when engine is cold. Once you drive a few miles, miss disappears. Misses were in all cylinders and more were in the 1,3,5 side.

Does it in the AM , but not in the PM drive home from work.


Some times there feels like there is a slight miss at highway speeds.

 

Hey! Well w/o any info as to year, one can start w/ the usual culprits:check engine light on? Plugs,wires,cap & rotor,coil,module.... or it could be a minor vacuum leak that closes as the engine & components expand. Fuel economy off? Several issues can be contributing to this factor-look at the simple stuff first,then see if you can pull a code
Let us know!

 

No codes at first.

It's a 99.


Looked like there was arching in the cap. Cleaned it out. Had a code for cylinder 4 missing next, tuesday morning.

Used wire dry spry in cap and dielectric grease on all connections and inside cap. Ran great at first no codes than seemed to develop slight miss.

Order AC delco cap and rotor as rotor looked to be slightly worn on electrode.