Missing/Idling Issue

1992 Buick Park Avenue - Base

This morning my serpentine belt tore and slapped everything for a few minutes and I'll be receiving a new one tomorrow or the day after, but that's not the trouble, I just feel it's related as that is when this problem started. In the last 2 months I have replaced the Cam sensor and interrupter, timing chain and tensioner were in good shape. replaced the ICM, coils, wires, and plugs and used dielectric grease on all connectors, including the cam sensor and new crank sensor, also replaced the harmonic balancer, fuel pump, filter, pressure regulator, PCV valve, alternator, and a new pigtail is coming for the cam sensor as some of the wires had bare spots. This plug is currently taped and shoved out of the way, not plugged in, and has been for a week, so I doubt it's relevant.

This issue is as follows:

The car fires up fine, but has great difficulty idling and stalls too often to drive after a few minutes. At higher RPMs it only misses or misfires occasionally. With the serpentine belt off, the car idles much smoother. Tonight I plan to try tightening the harmonic balancer again, running the with MAP sensor unplugged, again with the exhaust O2 sensor removed.


Any suggestions are welcome!

Wow lots of stuff done here, MAF's and connectors to it were an issue, reman units are not reliable, check fuel pressure for specs. Ok, so this all occurred when the belt broke. if so look for damaged connector at the cps.

Connector at the CPS seems to have been the culprit, I assume the wires were loose in the connector. Wiggled them and it runs fine :) At the same time I took off the harmonic balancer and checked for debris and found non, but the balancer went back in about 1/16" deeper than before, and easier. The first time I cleaned everything as well as I could with carb cleaner and a clean rag before oiling the press-fit section, but I guess something got in the way anyway.