Still missing - V6

[Asim]

Guys,

2000 V6. Mis-fire, more of a sputtering/stumble only when the car is hot. After its been on for 30 mins or so.

Changed:
all 6 coils
Valve cover gasket
upper intake gasket
PCV elbow
fuel filter
spark plugs

What the heck is it?

Again, runs fantastic until about 30 min of driving. At a constant rpm (highway) it feels fine, but as soon as i have to accelerate after a stop or anything, its bad. BTW, it doesn't mis when I rev in neutral (stick). Also at idle, like at a light, it does mis every 5 seconds or so.

Any help would be great.

Thanks

 

[97stscaddy]

Try some strong fuel system cleaner. If that doesn't fix it, you might have to wait for the CEL to come on and use the code to figure out whats going on. It could be a defective coil, but to figure out which one would be kind of a pita.

 

[Quik LS]

is it always when coming off idle?

if so, start looking into IAC or EGR.

 

[Asim]

Thank you Quik,

No its not just off-idle. Once it starts, again after 30 min at temp, its there for the entire rpm band.

No codes and its been like this for 2 months. (I don't drive the car often).

Any help would be appreciated.