Quote:
Originally Posted by VetteVet
Back in the early days when catalytic converters were new they would sometimes plug partially and performance would drastically decrease. I know you don't have a converter, but have you checked your muffler and exhaust system for a plug? If the truck has sat for a while the critters might have built a nest in there and that might be your issue.
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Seems unlikely. It billows smoke when it starts up (stops when warm).