rcman989
I'm Awesome
Baffled at 1997 Engine / Transmission Problems
I have a 1997 K1500 with V8/350. It has a Black Bear Performance tune, headers, and a cold air intake. This past winter it started to stumbles/bogs down/hesitates when I accelerate from stop, when at a stoplight sometimes at idle it will almost miss but it doesn't. I changed the spark plugs, wires, cap, rotor, coil, and fuel filter. It ran fine for a while after that, but tonight it did it again really bad. The codes showed misfire on cylinder 7, random misfire, and had a P1621 code which I have never seen before. It would accelerate fine when you really stepped on the gas, but when you held it at 55 it would hesitate, seems like it would try to shift, backfire, and had no power. I am assuming it is not transmission related because at a stop light it wouldn't idle right.
Any suggestions? Thanks in advance.
I have a 1997 K1500 with V8/350. It has a Black Bear Performance tune, headers, and a cold air intake. This past winter it started to stumbles/bogs down/hesitates when I accelerate from stop, when at a stoplight sometimes at idle it will almost miss but it doesn't. I changed the spark plugs, wires, cap, rotor, coil, and fuel filter. It ran fine for a while after that, but tonight it did it again really bad. The codes showed misfire on cylinder 7, random misfire, and had a P1621 code which I have never seen before. It would accelerate fine when you really stepped on the gas, but when you held it at 55 it would hesitate, seems like it would try to shift, backfire, and had no power. I am assuming it is not transmission related because at a stop light it wouldn't idle right.
Any suggestions? Thanks in advance.
Last edited: