Originally posted by beepbeep
I recognize the symptoms. If fueling is OK then I advise you to check spark-plug gaps and if needed, change plugs alltoghether.
What happends is that dense mixture effectivly extinguish the spark. It's too dense for spark to jump across. If problem persists, look for more powerful coils.
Beep is correct. I had a similar issue a while ago and once I installed a Crane HI-6 ignition system, the symptoms went away. The boost was literally blowing out the spark, resulting in the miss under heavy load
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition