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GT Level Member
04-26-2018
I have a 07 Grand Prix base that has this issue that keeps coming up but not all the time. Ok I will do the best to describe it. When I start up car and go car feels like it isn’t getting enough fuel but when I hit the gas it gets up and goes. Like hesitation and car doesn’t shift like it normally does like takes longer. But whenever it does this I can shut car off restart it and it runs perfect. Things I have done change mass air sensor o2 sensor plug and wires all gm replacements. Only mods really are intake transgo shift kit overkill tune. And I have put stock tune back on no change. And like I said it doesn’t happen all time it can go weeks without doing it. And it’s daily driven. Just looking for hints or help to try or something I am missing. Thanks in advance
07 base tinted windows led tails new wheels spo grills spo spoiler retrofit projectors transgo shift kit overkill tune inferno lip special edition rear lip 2.5 cat back dual exhaust
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04-26-2018
any codes popping up? what brand maf did you install? after market mafs kinda suck for the 3800.
98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails
L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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GT Level Member
04-26-2018
No codes and mass air was acdelco I have used two of another one from junkyard that was cleaned with mass air sensor cleaner just like original one in car. Do you think it still could be that? Car has 107k on it just don’t understand why it doesn’t do it all the time that is what has me puzzled
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04-26-2018
Have you removed the throttle body and cleaned it up? When the DBW stuff gets dirty it can cause strange issues. Just a thought.
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I break things.
04-26-2018
And be careful with cleaning the DBW throttle body... I had some really weird issues after cleaning mine the first time, turns out the throttle body cleaner spray actually got into the motor section and played hell with the circuit board in there.
If it needs a lot of cleaning, just open up the side cover after you clean it and let it dry out overnight.
04 GP GT2: Handling upgrades, go-slow parts, and an attitude. Totaled.
87 Dodge Ram 50: Junkyard rescue, resurrection in progress.
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GT Level Member
04-27-2018
I cleaned throttle body a few months ago. But guess could do it again to be sure.
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I break things.
04-28-2018
Hmm... are you sure it's not a transmission issue?
It almost sounds like your issue is really similar to the one I've had for years... No Forward Cold
If you can rev the engine before it goes into gear then it has very little to do with the engine itself. And the whole thing with shutting it off and restarting it to fix it? that's part of resetting the "limp mode" where it commands max pressure and shifts harshly, which you might not have noticed because of the shift kit in there.
I'm not the most knowledgeable on here, but I've got a decent handle on the 04+ particulars and the fact that you mentioned it taking longer to shift than normal tells me that it's at least partly a trans problem.
04 GP GT2: Handling upgrades, go-slow parts, and an attitude. Totaled.
87 Dodge Ram 50: Junkyard rescue, resurrection in progress.
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GT Level Member
05-30-2018
Well here to update thanks to all that replied. I cleaned off mass air flow sensor and took throttle body off cleaned it. Since then car has been running perfect even took road trip this weekend over 1000 miles no problem. So once again thanks.