Hesitation

[Partsguynick]

Saturday I went on a road trip. After two hours on the highway and another have in stop ago traffic. I park the car shut it off. then realize I need to move over a little bit. Get back in start it up. Starts right up but when I go to hit the gas it bogs and run ruff. Like it’s flooded almost. After slowly feathering the gas it seemed to clear out. Came back after a couple hours and it ran fine. It’s a 2000 ssei. New Gm coils, icm and fuel regulator. All Gm parts. I’m stumped. No codes either.

[peter]

How'd the exhaust smell? Any smoke? Does the car consume coolant? Has the intake manifold gasket been replaced at any point?

It's a shot in the dark but intake gaskets are a bit notorious on these. Wonder if you burnt off some coolant upon starting and then it cleared up. A leakdown test could help diagnosis if you think this is a possibility (unfortunately these intake gaskets can be a bit finicky and the heat cycle of the engine can affect whether it's letting coolant into the the intake runner or not).

[nos4blood70]

As mentioned above, check your coolant level and how your oil looks.

Did you ever clean your IAC or MAF sensor on the throttle body?

[Partsguynick]

Intake gaskets are updated to new aluminum ones, coolant Ellbows also. Doesn’t go through any coolant. Coolant is full and hasn’t moved. Car does use a quart of oil in between oil changes. Iac and maf were replaced a year ago. No smoke out of the exhaust. Didn’t notice any coolant smell. This is why I’m stumped