misfire on cold start.

[rob350]

When my car sits for awhile (a few days) I have a slight miss when I start it that usually lasts for 10-15 seconds. After that, I can drive it all day and not have a problem when starting it. The motor has 500 miles on it and i'm using R43TS spark plugs. I have been leaning towards a defective sparkplug? Am I using to cold of plugs? Any advice?

Thanks,

Rob

 

[challengermike]

Mine does the same thing.Its usually very minor,i was thinking it was maybe the coil pack.

 

[meanchicken]

So what's the verdict?
Mine started doing this now....you guys jinxed me.:frown:

When I start it up in the AM these last couple days, it seems like for the first 5-10 seconds, one or two cylinders aren't firing. After it runs beyond that, it smooths out and runs fine. It onlydoes this when I first start it in the AM.

This morning the engine shook so bad while it chugged itself to a smoth idle, my downpipe was bmping the floor.

Plugs and wires are fine and the coil pack ohms out OK. fuel pressure it 39 line on, 43 line off.

 

[Junior Samples]

Injectors perhaps?... Run some Acetone in the tank 3oz per 10 gals and see if it cleans up the pintels?