I noticed lately that my rpm's fluctuate about +/- 500-700 rpms while idling and driving part and wot.I can feel the car surge while I'm driving.Is this due to a dirty or bad TPS? Or any other possible causes?

------------------
'91 RS 5.0 TBI
New paint-solid black
ROH Snyper wheels-17x9 wrapped in 275/40/17
Eibach sportline springs
ASCD SS hood, High-rise Z-28 spoiler,
Hooker super comp headers,dual 3" exhaust,two 1-chamber Flomasters,Iroc sway bars,wonderbar,140 Iroc gauge cluster,Iroc steering box,Auto meter gauges,dual guage A-piller pods,open air filter,AFPR,smog delete
TBI mods,180* thermostat,
383 stroker in the works

President-Austin 3rd Gen F-body c.c.
Austin 3rd Gen F-body c.c. message board at
www.hpsmotorsports.net
See my car and others at www.ride4life.net

 

No ideas anyone?

 

Are you throwing any codes? Could be TPS or IAC, bad gas, etc. I had the same problem. I replaced my TPS and IAC, and it seems to have gone away (for now).

------------------
91RS convertible 355 TBI 65# inj. custom compcam grind .480/.480, Edelbrock TBI manifold, open element, hedman hedders, Y-pipe, cheap cherry bomb muffler, Hypertech cop car thermomaster, Accel coil, wires. 2.02/1.6 cast iron heads. Engine specially made by Pflugerville machine shop. Forged bottom end, balanced. Coming soon: Vacuum controlled FPR, better exhaust, Torque converter, DIY PROM, bigger TB.

 

Actually,I just pulled my codes yesterday. 13,15,32,42,and43.I know 13,15 and I think 32 are new codes.Just last week before the surging problem,I checked and I only had egr codes.Since the problem started,I pulled the other three codes,but lost my repair manual with the code descriptions.Anyone know what 13 and 15 are? Or where I can find them until I find my book again?Thanx.

 

You can find the code list on this web site (home page) under FAQ. It's at the very end of the FAQ's. I am also having the same problems you are except my car will die if I don't give it gas when i crank it up. I got a code 15 and code 32. Still haven't figured out exactly what to do.

------------------
1988 305 TBI camaro. Flowmaster exhaust, K&N air filter, complete IROC-Z makeover (stripes, ground effects, interior...etc), kenwood c.d. player.

 

i had the same problem i am going to change my o2 sensor today..my car also bogs out at open throttle.. i just checked the fuse panel and i had one called the APC blown nobody knows what it stands for but it was blown dont know if it did anything though...
Shawn

i want to know what it could be too...