Ok, in summary:

1993 Vortec 4.3 W Vin,

Work done: EGR removed and cleaned w/ new gasket, new cap and rotor, new plugs (Delco), new Spider, new nutkit, new coolant temp sensor, new IAC valve, seafoamed tank and intake, new gas, new fuel filter, new fuel pump 10K mi. ago, new connector for knock sensor.

Blazer lopes on idle, stalling, ocassionally with a few bucks/pops. If bypass mode (tan/white wires) is run, blazer stops loping, won't stall, but runs like crap.

Seems worse when cold, some days no issues.

Any thoughts? It's driving me nuts not to have my wheels and the garages around here aren't helping.

~Ted

 

no ses light other than when you unhook the pass.compartment wire? JP

 

Only get SES when timing sensor is unplugged...

 

when u replaced the spider kit and nut kit did u notice any clean/dirty areas?

 

Pass. side near FPR was "clean", but now that spider and nutkit are replaced, neither should be an issue. Old nut kit was cracked on inside of bend, old spider seemed ok, but FPR could've been bad.

 

Problem finally solved...I think. Time will tell. Turns out it was a bad distributor (whole unit), bearing were shot, allowing movement and variable messed up timing to computer. That's why bypass worked, but problem was intermittant. Will re-post if it turns out not to be fixed... On the plus side, I've replaced all the common bad parts, so I should be good for another 150K!