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while driving car wont go past 3000 rpm

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greg90gs

10+ Year Contributor
147
1
Jun 1, 2009
des moines, Iowa
ok guys my buddy just bought a 1g 4g63 nt and the guy said it runs fine till warmed up and loses power but while driving it home we found that the car wont go past 300 rpm it runs fine and it will still pick up speed as far as we can take it as long as we shift before 3000 rpm any ideas on what this could be, it is all stock but the guy for some reason put in a wally 255, could this be the cause, he also said he replaced the maf
 
hey guys i am the guy that owns the car that greg posted this for thank you i appricate the help
 
what does it do when you reach 3000 rmp does it just fall flat does it sputter back fire ???

when i am driving after the car warms up if i get to 3000rpm it just falls on its face but if i back off and let it idle or shut it down and then restart it, it will run fine for a few minutes
 
when i am driving after the car warms up if i get to 3000rpm it just falls on its face but if i back off and let it idle or shut it down and then restart it, it will run fine for a few minutes

check your ignitor sometimes it can loosen up at the manifold
 
fuel cut, bad maf, ecu bad, tune up needed...sounds like you are putting more air in your system than the ecu "wants" you to on stock settings. this means you will have to get a larger fuel system to allow more fuel particles to equal out and have a stable air-fuel ratio. make sure you have the proper sized or tuned injectors and fuel pump! also make sure you install BOTH components and have it tuned!!
 
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