Whenever I drive and put the car in neutral while coasting the rpm will jump up to about 1,800 rpm, and it only goes to the normal 700 rpm when i come to a stop(still in neutral). I don't think its sticky throtle blades because the rpm drop when i come to a stop. This also happened before i put the manifold in, but not as bad(only to 1500 rpm). Could this have something to do with the throttle position sensor or the throttle cables? Thanks

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Pat Hirsz
www.iit.edu/~hirspat/MyPage2.htm
88 305TBI
Mods:Hooker Aerochamber 3" exhaust, gutted kitty, March pullies, no smog, 180 thermo,
14x4 K&N, 3.42 gears(open), Ultimate TBI Mods,AFPR,MSD(ignition,coil&wires),Edelbrock TBI Manifold, 195ltr/hr fuel pump,
Eibach springs with KYB's all around,
Harwood cowl hood, Z-28 wing, fresh paint(black)
120,000 miles, 5spd, T-tops,slp headers on its way

92 RS, 305TBI, auto, 3.08 gears, 180 thermo, glasspack (no muffler)

 

That's normal. When you're moving above a certain speed it's not supposed to return to normal idle.

 

Yes, but 1800-2000 rpm is still kind of high, it wasn't this high before. I'll try and adjust my throttle cable and see what happens.
p.s. I finally got my headers today, will be installing them this weekend.