I have a miss at WOT under a load usually at high RPMs. Heres everything I've done yet hasn't solved anything. I bought a new fuel filter and it didn't help. The missing doesn't really feel like its starving for gas though, it feels more like an electrical problem. We switched out the LTCC boxes just to make sure it wasn't that but it didn't help. We tested the coils and the resistance seems ok in all of them. We switched out coils. We looked at all the wires and nothing seems hurt, all the grounds are good, theres no flashing lights in the LTCC box. The plugs are new TR6's and the plug wires were recently changed before this last rebuild. I'd say they have about 1500 miles on them max. This opti has maybe 2500-3000 miles. Its not throwing any codes, theres no code history. The miss is only under a load at WOT. I can be WOT spinning the tires in first, second, third, and theres no miss until it hooks up. So the only other thing I can think of is the fuel pump is old and weak and can't keep up anymore. Replaced the fuel pump today, still missing. What do you guys think?

 

Anyone?

 

Does it perform well in open loop but go to hell when it is in closed loop?

Have you tried forcing it to stay in open loop to see if the problem is related to closed loop operation?

I have a closed loop problem at the moment that I have not had a lot of time to look further for.