sputter after fuel pump hotwire
Ok, long story short I took my car to 3sx for a tune and it was determined the fuel pump was on its way out due to a loss of pressure at higher rpm's. pump was changed to a aem 340 from walbro 255 and it was also determined that it needed a hotwire due to voltage loss. so I ordered the kit and hot wired it and I am bringing the car back to for a retune friday. On a test drive right after hotwiring, on a few occassions at low load I would get a stutter, like the fuel pump was cutting off. Battery voltage would look fine but AFR's off the gauge lean. I would give it some gas and it would recover and be normal. Did this a few times during test drive sunday but cleared up and didnt do it agian until this morning and it only did it once. Any idea on what this could be? I am leaning toward a problem with the tune and the ecu trying to compensate because low's were tunned for a 255 pump non hotwired. I am also over running the FPR. Any help is much appreciated!
