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    Fuel trims

    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?
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    Engine misfire

    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?
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    98 Silverado

    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?
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