man i can not figure thisout my car has started out of nowhwere running lean under throttle. At idle afr's are normal but when i go to give it gas it starts to hesitate and stumble on itself. afr's shoot up to 15's and sumtimes 16's. I have changed the fuel filter and the fuel pump is a walbro...any suggestions?

 

did you check the injectors, all your lines make sure your not losing fuel? is it around a certain rpm as in secondary injectors not coming fully online?

 

i looked for that yesterday......... not sure what it could be. Secondary's fire at 3800 i believe so that would rule that out prolly gonna get a f/p gauge and check it.