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Discussion Starter #1
Hey guys i will appreciate any advice taht help me troubleshoot my problem...

i when to the dyno and got 400hp everything running fine and 2 days after my car when lean to 18, and when i am driving the car is lean but when i have to stop the car go all way rich and start misfiring when i press the gas again, sometimes the car is cold shuts off, and sometimes the car run 13-14 for couple seconds and then go all way lean again

I check fuel pressure and is normal,i check all fuel injector they good
 

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Shazaam
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4,601 Posts
How are you checking fuel pressure? Do you have an in cabin gauge that shows fuel pressure through out the RPM range or just a mechanical gauge so that you can check fuel pressure at idle?

Just based on the information you have provided I'd lean towards fuel pump failure or clogged fuel filter. The fuel pump may operate fine when you are in vacuum and fuel pressure is relatively low but as you increase RPM, boost pressure and therefore fuel pressure the pump may not be keeping up as well.
 
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