zanderwitaz

Ok, I thought this was going to end once I got my tune, but it hasnt. Sometimes my car revs up really easily, and sometimes its still sluggish. Usually when the sound of the exhaust matches the timing of the pistons firing during idle, my engine runs really really well. but most of the time, thats not the case. Usually my exhaust sounds nothing like the firing of the pistons. I dont know anyone else with a V8 stang to compare to, so I dont know if this is normal or not. But my engine likes to run at about 2am and is extremely sluggish when cold.

tool fan

All experience I have had with V8's that is common especially with carborated V8's. Just let it idle for a few minutes before you roll out

Acer2428

When you start changing things, it's bound to happen. Mine was "moody" as well.

70 MACH I

Two things come to mind, off road, Xpipes Are your front two O2 sensors connected securely, no burnt wires, if you ae using harness extensions, they OK. second, your predator tuner, set your settings back to stock, then bring up each item in your trim up to where you had it, but gradual on each. You may have a tuning issue, too much spark advance/fuel in your Rpm curve.
John

TimmyGt

have you looked at thinks like the sparke plugs see if there clean, injectors they might need to be cleaned as well. but I dont know I have not had my 97 V8 do that do me and it get cold where I live it still runs fine (-10*) last week with the wind chill it was (-34*)[&:]

96WhiteGT

The way it sounds, i think you need to clean some stuff internaly, injectors, maybe your manifold, just go through and clean everything good and see if that helps. The car i just got rid of was having the same problems and i took it to the dealer and had them spray this crap into my intake system and cleaned everything out and the car ran amazing, no hard starts, no weird idles and it wasnt sluggish anymore below 3 grand.

sandcracker21

what mustang do you have?

how much did that cost

zanderwitaz

Its been this way as long as I can remember. Im not using 02 extensions, and its actually running better with advanced timing. the mileage is going up as well,but still isnt perfect. Im not sure If i want to take my fuel system and manifold apart, im not that familiar with my engine bay. does anyone else with a 1999-2004 GT have similar problems? but man,when the exhaust and the crank match up, its like driving a whole new car. the power difference is increbible.

wwmost

i dont get when you say your exhaust and your crank match up. explain

ackuric

My mustang is definitely moody, she seems to be getting better, i've had occasions where rpms didnt want to climb. maybe my torque converter was locked? dunno. but since i cleaned my maf, changed coolant, and tranny fluid w/ the shift kit, and synthetic oil, my god, she definitely does things she hasnt done since i got her. i remember racing some ricer and hitting 2nd with my rear end kicking out like a mad man, with my heavy 200lb friend in the back, and another passenger, she hasnt done anything like that since then. =(