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1994 Sierra Ignition Question



I have a 1994 GMC Sierra that has been having stalling issues. ( You may have seen previous posts...)

Here's the specs:

1994 GMC K1500 K Vin code

350 engine

Auto Trans

4 Wheel Drive

174k Miles


What I am wondering is what exactly tells the the to start and then run. I have problems with the truck mostly at a cold start. It will start right up and the die as if the key has been turned off. If it has been running and i shut it off for a short periond of time it will start and run no problem. Is it possible that the key switch itself is going out? I have jiggled it the best I can while it is running and it doesn't stall. I am convince that this problem has nothing to do with fuel delivery as I have verified that it is good right up until the truck stalls.

Here's what i have already replaced:

Plugs and Wires

Ignition Coil

Ignition Module

Ignition Switch

Fuel Pump Relay

Fuel Filter

Coolant Temp Sensor

Block Temp Sensor

Negative Battery Cable


Every once and a while it will shut off while I am driving 70 down the highway, no choking or sputtering it just shuts off.

I also get no codes from the ECM and I have verified that the ECM is not the problem. I seems to me that I have a bad connection somewhere and I am wondering where to look. :cheers:


Thanks in advance!

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