98 Silverado, 383ci, upgraded spider, full length headers, no cats, no egr, black bear ecu. Long term fuel trim bank 2 is 25-30 at idle and I get po305 code or po300 code. New plugs, wires, distributor. Any suggestions?
98 Silverado 5.7, 2wd. When going up a steep grade the truck will start missing really bad and check engine light starts flashing. When back on level ground it clears up. Any ideas?
My 98 Silverado sometimes shifts really hard on 1-2, however if I clear the codes it stops. This is even when a code isn't present . It would eventually show p1870 code. TPS maybe? TCC?