bigalpha
Moderator
- Location
- Tucson, AZ
Yeah, I replaced both the IAC and TPS with new (properly calibrated) and it made no difference.
There is also no rattling coming from the cat and nothing to lead me to think it's clogged/broken.
Yes, every time the vacuum gauge would spike, it corresponded to an increase in the RPMs. The RPMs would spike, then a fraction of a second later, the vacuum needle would spike.
The truck drives fine and I don't notice any issues with it. HOWEVER, when the engine is cold and I start it up, I can hit the gas and there is a momentary delay of nothing, then the engine revvs. It almost sounds like it bogs down then catches up to itself. Then there is a popping sound coming from the engine bay. I can't tell where it's location is. I didn't notice this until I was fooling around yesterday with the vacuum gauge.
There is also no rattling coming from the cat and nothing to lead me to think it's clogged/broken.
Yes, every time the vacuum gauge would spike, it corresponded to an increase in the RPMs. The RPMs would spike, then a fraction of a second later, the vacuum needle would spike.
The truck drives fine and I don't notice any issues with it. HOWEVER, when the engine is cold and I start it up, I can hit the gas and there is a momentary delay of nothing, then the engine revvs. It almost sounds like it bogs down then catches up to itself. Then there is a popping sound coming from the engine bay. I can't tell where it's location is. I didn't notice this until I was fooling around yesterday with the vacuum gauge.