Tracking down a miss Options

[jmargush]

2056 running L-jet

Car starts and has a noticeable miss when cold, popping while holding throttle at 2k.

Once warmed up it seems to flatten out and run a bit smother.

However under acceleration it just doesn't feel like it has much power and it feels like it could be running on 3 cylinders.

Spark on all cylinders
All 4 Injectors are spraying with good patterns
Fuel filter was changed at the beginning of the summer
Fuel pressure was 33 @ idle and 35 under acceleration and 39 under hard acceleration when checked the other month.

I put in a new fuel pump relay due tot he old one giving me issues. The only thing left that I can think of is does the wiring harness have a broken wire in it that makes partial contact at times, but don't know if that would even create symptoms like this.

Any ideas of where or what else to look for?

[Bob L.]

Where is the popping coming from? Intake or exhaust?