It started to sputter over 10 psi after putting mobil gas in the car. The sputter sounds like its firing in the header(antilag) but only when you reach 10 or more psi. You can rev it up to the rev limiter and its fine, its only when your under a load at 10+ psi. I thought it might have been bad gas so i drained it out and replaced the plugs and even tried a different set of coils. The car has tbe, walbro 255 pump, mbc, intake and a flash.

Any input would be helpfull thanks in advance.

 

Sounds like water / condensation in the gas. Put at $1.99 bottle of STP gas treatment (red bottle) in the tank and see if it goes away. It shouldn't take more than a few minutes for the gas treatment to totally displace the water.

 

Did it just happen suddenly when this gas went in, or did it work into it as time progressed. It might be the spark plugs. Check and make sure there gapped at like .26mm

 

Sounds like you need to get a scanner and check for possible trouble codes.

 

if it happened when suddenly after getting gas, is this a sign of bad gas?

 

I would say so. But for it to be sputtering, that would have to be really horrible gas. I have gotten bad gas before, but all it does is knock a little to much, and set off my ECU, switching me to the low octaine/ saftey map, and ill just run the gas through, and then reset the ECU when I get new gasoline. Thats why I only put like 4-5 gallons in at a time, gas is so inconsitant in jacksonville, I get a bad tank like once a month.

 

Its not throwing any codes and i repalced the plugs twice even tried a different brand. As for the gas i put it in heet but it didnt work so i drained the entire tank and put new gas in. It started the sputtering about 5-10 minutes after putting the gas in.

 

big boost leak that's opening up at 10psi? and then self closing? I dunno the only time I've ever had my car sputter like that is when I blew an intercooler pipe (and I've done it a few times hah)

man that is a wierd problem, if you figure it out BE SURE TO POST BACK HERE.

 

Did you change out to new wirers also.I had the same problem,I put
in new coils and wirers .Problem was fixed for me.

 

we checked over all the piping for any boost leaks and couldnt find any.My next step is to replace the wires.

 

I agree with FLAEVO. Swap wires with someone. I've had similar problems in the past and the wires were the culprit.

 

Hey so what was wrong? because i'm having the same issue!