Misfire when warm

[Tori]

Hi guys,... looking for some advice on what else to look at with my misfire situation.

Just got the car to pass smog a few weeks ago, put all my perf. goodies back in place and have been driving the car a good bit since with no issues. Then about a week ago it started to randomly misfire. At first it was maybe only once during a 8 mile around town cruise. Just a big hic-cup, like the ignition shut off for a second then it would recover and be good for a while. It has gradually gotten worse, and now once warm it'll start misfiring and cutting out at around 2500 rpm. I does not do this when cold. Once it gets to about 130* i can make it misfire around 2500 rpm.

I've replaced the spark plugs, and wires with zero change.

Thinking of doing O2 sensor next. When cold its in closed loop right ? What comes into play after it starts to warm up. ? What else should i be considering ?

 

[626gn]

If you're still running the factory ignition system, I'd look at the coil pack and/or module as possible culprits. Ignition problems will often show itself after warming up a bit.

 

[Tori]

I should have mentioned the coil pack and module are both brand new. Module is a Delco unit.