I have a 1990 Chevy 1500 Silverado, 305 w/ TBI injection. New Injectors, fuel pump & tank & filter. Idle is way too low when started, So I installed a new "Idle Air Control Module" but it made little difference. Last month I had some electrical problems that wound up being a bad EPCM and we installed a new EPCM and calpak chip. But no matter what I do, I can't find this low Idle gremlins. I've looked for a vacuum leak but I can't find it and the EPCM doesn't leave any trouble codes as I have check five times now. I'm out of ideas now ???? Thank you !