my dad just bought this 92 mustang gt that had a few problems. we fixed the ones we can find so far but still got one major problem. befor we got it it was dyno tuned at 485hp. the main problem with the car was it was sittin for a month or so cause of wiring issues. now since we fixed all that and drove it a few times it still is not right. it seems to always be getting to much fuel untill it gets to higher rpms. now does the computer need to be re flashed since it was dissconected from the battery for so long? if not what else would cause this? thank you for your time

 

If it was tuned, then there must be a chip installed. Maybe it lost its memory or something being without power for such a long time...?

 

By dyno tune you mean that a chip was installed on the back of the ecu?
Confirmed the presence of the chip by pulling the ecu?

Sitting with the battery disconnected will not affect the program that was loaded to the chip, it doesn't matter how long it was sitting.

Codes?

 

how do you know its getting too much fuel? have you put a wideband o2 on it?

 

How do you know that it wasn't doing this before? I've seen some pretty poor "dyno tunes" where they just toss in larger injectors with a calibrated MAF. Then they just adjust timing and fuel pressure manually. They can still reach decent HP numbers while still ahving problems on the lower end.

First thing you should do is pull the computer to see if there's a chip attached to the port.

Of course, I'd also like to know how you know it's running rich.