ok guys so ive just completed my swap and it idles great!!! and drives great until about a 1/4 throttle when it starts to sputter and die ive done some research and it sounds like A DIRTY MAF which ive now cleaned TWICE!!!! i also thought it may be a bad fuel pressure regulator because when i pinch the return lines it revs just fine!!! i have no idea what to do next, help would be greatly appreciated!!!

 

Check the TPS

Unless you have a bad filter or a fuel blockage, it should rev even with a bad fuel pressure regulator.

The other question I would have is, did the 3.4 run well before the swap?

 

yes it did. i bought a rolled 4runner and as soon as i got it home and charged the bat. it fired right up and went through all rpm ranges just fine.... but that was 3 months ago.

also when i crimp the return line she runs awesome. i just through a vice grip on the line and drove it up and down the block and it ran perfectly. ( could light up my 32's in 4th gear ) lol

so could it still be a tps???

 

You have a 2001 engine, which IIRC uses a partial drive by wire system. That one is beyond my particular knowledge

 

well thats actually a typo.. its a 2000 4runner

 

Then what I say about the TPS is valid. 2000 uses a drive by cable system with a standard TPS

 

well i'll give the tps a look over tomorrow.. thanks for the advice and i'll keep ya posted

 

ok i replaced the tps and it changes nothing... i went through all my wires for tps and maf and they all check out... so once again it comes back to fuel pressure... what is the best way to check and see if my fpr is bad???