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Kat · 10-06-2009, 06:24 PM

Going into second gear about 3/8th throttle the car stumbles falls flat on its face, hits second gear and does that for a little bit. Then takes off and goes. Car does seem down on power from what it was when it was new. The stumble problem is itermittent also.

Things done..

Cleaned MAF
Cleaned IAC
New plugs, wires, front O2's, fuel filter, fuel pressure is dead nuts on 58 psi all the way through the RPM range.

The auto xray shows that everything is working aside from going a little bit lean.. Which I atest to factory programing.

Odd ball thing about is that it does throw the P0420 code for cat inefficeny (also P0137 and P0157). As far as I know those codes wont throw the car into limp home mode.. Then again I never looked into it either.

Mods done to the car are mostly suspension stuff, magnaflow cat back, SLP airlid and K&N.

Any ideas? Maybe it just might need the Amsoil mod...

10-06-2009, 06:24 PM	#1
Kat 11 Second Club Join Date: Feb 2006 Posts: 932 iTrader: (2)	Part throttle stumble 00 LS1 Going into second gear about 3/8th throttle the car stumbles falls flat on its face, hits second gear and does that for a little bit. Then takes off and goes. Car does seem down on power from what it was when it was new. The stumble problem is itermittent also. Things done.. Cleaned MAF Cleaned IAC New plugs, wires, front O2's, fuel filter, fuel pressure is dead nuts on 58 psi all the way through the RPM range. The auto xray shows that everything is working aside from going a little bit lean.. Which I atest to factory programing. Odd ball thing about is that it does throw the P0420 code for cat inefficeny (also P0137 and P0157). As far as I know those codes wont throw the car into limp home mode.. Then again I never looked into it either. Mods done to the car are mostly suspension stuff, magnaflow cat back, SLP airlid and K&N. Any ideas? Maybe it just might need the Amsoil mod... __________________ 2004 GTO GMM shifter Spohn stuff, tint and my love...... 1988 Camaro Vert -Sold Last edited by Kat; 10-06-2009 at 06:25 PM.