Started off good. Tuner had engine running good, dynoed almost 400 RW. Drove car for a while and found that engine had a tendency to die at stop light or slow turn.
Tuner rechecked and made some adjustments but was not able to "fix" the issue. Then found out if the AC was turned off , engine ran good. So, added window switch to compressor circuit to kick in above 1300 rpm. That worked fine.
However, the real issue was found out before adding the switch. Somewhere during all the "adjusting" the throttle blade started not opening fully. Car ran fine , but only had medium power.
I swapped TB, TAC Module, Pedal Position Sensor and no dice.With scanner plugged in , engine on or off, TPS shows 55% at full pedal. Visual inspection confirms this. 18% at idle.
Background: Engine is a LQ9 out of a 2004 Escalade, complete pull out,
I freshened up the bottom end, had a 706 head off a 5.3 cleaned up and installed . Comp about 11:1, Installed BT Stage 3, with 52 injectors. 2007 TB Manifold. Headers, thats it.
Im not a tuner but will relay any inputs to my tuner. Car is a 96 Impala/4L60e with custom wiring harness from South Florida. $1000 worth.
Also , noticed that cruise control has stopped working. Not sure if that means anything.
Really would appreciate any input or questions. Im Stumped.