lilley76

new Trans AM owner (305 TPI, Flowmaster, headers, posi).Love the car, but having a prob. When car's in drive, sitting at a stop, idles real rough & surging. Have tried adjusting throttle body sensor, timing & checked alternator. What am I missing?

airdeano

hows the 'tune' of the engine? stuck EGR?
plugs? wires? fuel pressure? does the system
go into closed loop? ya gotta wide range of
symtoms with many different causes.
basics:
1. air and fuel
2. compression
3. spark
those three are the keys to an engines performance.
have a power balance test done to determine
if one or more cylindess are contributing to
the roughness.
since it is new.. i always change the oil, filters
and plugs. compression check the cylinders.
thatll give me a baseline for anything that
might come up.
airdeano

u r sofa king we tah did

surging at idle could be any of the things already mentioned, or it also could be a vacuum leak somewhere. to check for vacuum leaks i spray a small amount of starting fluid in quick squirts around the intake, if the idle changes drastically, then you have a leak. be carefull with the starting fluid though, too much can be bad. just use quick small squirts.

MAXGTA2002

I tend to agree with the vacume leak, hows your brakes, is your booster leaking? I would start with checking for a vacume leak.