Join Date: Jul 2001
Location: St. Simons Island, GA
blueskyjack is offline
High idle sounds like a...
vacuum line is loose or broken. Check the small line at the back of the manifold near the distributor that T's off for the vacuum canister, cruise and heater controls.
The running rich could be your first warning that the regulator on your CPI unit inside the manifold is starting to leak (common problem with the CPI engine). If it is you'll soon get code 32 EGR, very stinky exhaust smell and rough idle as well. I replaced mine at 147,000 miles with the new improved design unit p/n 17113673 for $265. PM or email me if you need more info.
You can also clear the computer codes by removing the ECMB fuse. I think it is number 9, bottom left of fuse panel.
'94 Jimmy, 4.3/CPI, CFM Stage III heads, Ferrea stainless valves, Comp 1.52 rollers & ovate wire springs, ARP studs, K&N Gen II & CAI, Stage II chip, 160 thermo, Dynomax SS Ultra-Flow catback, Zexel LSD, 3.42, Shift+, electric fan, UD crank pulley, Jacobs w/ Ultra-Coil, Taylor Spiro-Pro, Rapidfires