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I have a 95 GMC 3500HD stake body dump with a 454 that I just purchased a month ago. It seems to run fine for a couple miles till it gets up to temp (220 deg.) and then starts puttering. Even with no load or towing. Mechanic said to change thermostat to 180 deg which has been done. Did not help much. I said fuel pump maybe, any other suggestions before replacing that? Just seems odd that it does it around operating temp. NOTE-before this started I put a K&N filter in it that morning, not sure if there is any correlation. Any advice or ideas would be tremendously appreciated.
Thanks, Dan
Check the K&N filter for excessive oiling,this may coat the Mass Air Flow Senser with oil causing problems with the ECM control circuit.Put the proper thermostat back in.Good Luck Mike
The K&N filter was purchased by me. It was pre-oiled so I didn't add anything to it. Is it bad to use the 180 degree thermostat? I was going to get a 160 that was available for the 454 but AutoZone said that it could be counterproductive in that the coolant wouldn't have time to cool itself since it would be constantly recirculating. By the way, does anyone use a K&N on their 454, and do you notice any improvements? Thanks, Dan
Check the rotor and cap to see if there is excessive wear and corrosion. also the wires could be breaking down. did you solve the problem yet? hope this helps.