May 13, 2010Hi guys, please help. 1991 C1500 5.7l/350 TBI engine with 154k miles. When the air temperature is up like in the afternoon I have a loss of power and backfiring through the exhaust when I accelerate or go uphill. The truck has new battery, alternator, wires, plugs, coil and the distributor is less than a year old. Not sure if this is pertinent but I also replaced the radiator, temp sending unit and thermostat recently. I`m not sure what else to do.
Thanks in advance,