Quote Originally Posted by RCcola55 View Post
glowing headers can mean lean or rich, its not really a tell all symptom. You very well could be right John, as one this thing is running, there is never a lean backfire. We had the wideband o2 to moniter A/F ratio, that being said the numbers were in the safe range, but I think its a time issue and misfire keeping it from its full potential. After Flem and I spent the day at FIS in SA, i think there is a chance of some dyno tune time, but that is all up to Ed
The worst problem was that the motor would run great for a short period of time but when we started driving down the road to the course at around 2000 rpm the motor would start to backfire badly and you had too keep the RPMs up around 4000 rpm just so you could drive down the road. It always seemed to stumble around 2000 rpm.

Also when we pulled the air filter to build the snorkel it was evident that the motor was only backfiring through one TBI I believe that it was the rear one.

Also how did you set fuel pressure with the fuel pressure gauge on the high pressure (inlet) side of the fuel pressure regulator