Missing on WOT or heavy engine load

[SpeedAddict62]

I have an interesting problem that recently started. After doing a 4th gear pull, I left off and the engine sounded like it was running on three cylinders (loss of power, wideband pegged lean, sounds kind of like a Suby). I immediately slowed down, thinking something was seriously wrong, but within 30 seconds it was back to normal. Cruising around town feels just fine, but under heavy load (boosting more than say, 5 psi, or going uphill) it starts to miss and then starts running fine in less than a minute.

Fuel system is a Walbro 255 HP with 1000cc injectors. Tuning with an Ostrich and Tunerpro RT. Its a really rough tune (I had to install the injectors and leave in a hurry) but the global fuel trim and deadtime are in the ballpark. I haven't tuned any further because I'm waiting for a new exhaust mani to turbine housing gasket to replace the SS one that broke and I'm sure my 02 readings are thrown off because of it.

At first I thought this was something internal, but now I'm not sure, since the problem is just intermittent. Anyway have any ideas? Oh, and before anyone says anything, yes I know I'm overrunning my stock FPR, and I plan to buy one soon.

 

[123abc]

Check your injector clips. The number 1 injector clip always pops off if I do some showing off with a double clutch.

 

[SpiralOut]

what plugs are you using?

 

[SpeedAddict62]

Actually, one of the injector clips is broken...its on there just fine but I should probably fix that, huh?

Spark plugs are BPR7ES gapped at .028.

 

[SpeedAddict62]

I'm 99% sure I found the problem...

I forgot to install those little "covers" on either side of the head when I had the head rebuilt. That allowed the spark plug wires to get cozy with my cam gear. The cam gear had started eating into the #3 spark plug wire enough that the wire was grounding to the cam gear, so no spark on #3.