rough idle when cold

[hdog69ush]

I am a new owner of a 1986 Grand Nash. I just got the car a few weeks ago. Former owner of a 87' SS monte Carlo. I have a rough idle when first start vehicle after a few days of sitting. No codes and No check engine light, car also passed smog inspection, no problem, does have a hypertech chip installed. any help would be great. Thanks

 

[Junior Samples]

Man it could be a dozen things, buy yourself a scan tool be it, scanmaster, direct scan, turbo link

hook one up and post the numbers

and get rid of that chip

 

[Just a Six??]

DUMP that Chip!! Get a Turbo tweak from Eric Marshall!