Also alot of people just dont think of this but as part of the tune up its a good idea to pull off the tbi unit and rebuild it, the o rings shrink, especially of they havent been replaced since they started using ethonol in the gas,and the pod half gaskets get old and leak and regulators go bad and leak excess fuel. Not sure how long you have had the car, but I pull off and rebuild em on every vehicle I buy with tbi, over the years other so call mecahanics get in there and really screw shit up, I bought a 92 4.3 4x4 s10 and when i pulled the tbi unit off, it had no base gasket, then the pod housing was covered in jb weld because the idiots installed the injectors in backwards and it wouldnt sit down flush because the pins where not in the notches..LOL I tell you man Ive seen it all.