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ok i recently had my car fixed due to misfires, thank god it was only plugs. but now that ive got it back its decided to grow some balls. Its all of a sudden running 20 psi after 5k till redline and pulls harder than ever i didnt have traction control off or cruise controll on so idk what it could be. the chevrolet dealer had it on there computer for two weeks and said nothing about a tune. any help or something i can check. i got 9000 miles on it and if its tuned dont wanna let the dealer really dig and loose my warranty. so that said is there anyway i can check for a tune or anything.... by the way if this is the way a gm stage car runs i love it
 

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ive never heard of stock spiking 20 psi. its probley tuned. ive spiked to 17 psi and people say im full of crap so 20 id say tuned but i dont know alot bout that kinda thing. as on how to check take it to a tune shop and have em take a look only thing i can think of doing.
 

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thanks. its spiking 20 now for a second then falls back to 17. but while its up that high its pulling hard. guess its time to get the gms1 done
 

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the dealer told me that 20 wont hurt on a stock motor. And that yes they will spike 20 stock NOT tuned they also said that as long as it doesnt pull over 20 that it will be perfectly fine. he said reason being is that all cars are not the same and some are a little more capable of it than others. i ask him about the gms1 and he said that when i hold 20 thats what the car will run like under boost that all it will do is help it run better before that. and not bog down while not in boost.
 
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