I am at a loss with this one. I replaced the intake and exhaust gaskets in my 88 454. She was chugging and had visible and audible exhaust leaks. The engine runs great now at idle and timing is steady at 4 deg BTDC. New plugs, wires and distributor cap. Manifolds were torqued to specifications and to my knowledge I put everything back by the book. I now have a backfire through the TBI from 25 to 45 MPH usually under load. (9K suburban is a load at level). The backfire will stop and I get full power without hesitation if I floor it. I replaced the coil and have triple checked everything. I am getting ready to dump $95 on a distributor as the electronic advance looks funky to me. Anyone else have any other suggestions?
- posted
17 years ago