Hello Everyone,
I have been battling this problem for quite some time now, I have a 1994 Sierra C1500 with a new motor (less than 15,000 miles). I’m having this issue where the RPMs will rev randomly, most of the time it’s quick and not noticeable like in the video, but other times the truck will jump forward. When I start the truck as well it will have a rhythmic up and down movement as it starts to move down to regular idle. I don’t have an high idle, it usual ranges from 700-800. I have replaced all the know sensors, spark plug, wires, distributor rotor, and distributor cap. I have not replaced the MAP or O2 sensor. I have also rebuilt the TBI with a kit from Oreilys. The engine also doesn’t feel like it’s at its full power, sometimes it will be, but other times it feels lazy almost. Any advice would be appreciated and I would like to solve this problem to help others who may have something similar.
I have been battling this problem for quite some time now, I have a 1994 Sierra C1500 with a new motor (less than 15,000 miles). I’m having this issue where the RPMs will rev randomly, most of the time it’s quick and not noticeable like in the video, but other times the truck will jump forward. When I start the truck as well it will have a rhythmic up and down movement as it starts to move down to regular idle. I don’t have an high idle, it usual ranges from 700-800. I have replaced all the know sensors, spark plug, wires, distributor rotor, and distributor cap. I have not replaced the MAP or O2 sensor. I have also rebuilt the TBI with a kit from Oreilys. The engine also doesn’t feel like it’s at its full power, sometimes it will be, but other times it feels lazy almost. Any advice would be appreciated and I would like to solve this problem to help others who may have something similar.
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