Hello all looking for some help, got an 89 2500R 5.7 2 wheel drive Suburban ran good the person who owned it before me got it tuned up changed the heater core and a couple of other things. Put plates on the truck went to dinner with the wife and kids came out wouldn't start. Had it towed home.
Replaced the fuel pump,fuel filter, cleaned the gas tank, changed the pig tail connection for the fuel pump, rebuilt the throttle body, changed both sets of wires for the injectors, changed the coolant tempture sensor,then changed the ECM using the same prom and calpak, followed all directions diconnected the battery changed it out reconnected the battery truck started right up. BEUTIFUL. got a code 12 ( nothing wrong) drove around got gas a sticker, truck running a little slugish I would step on the gas and it wouldn't really go then it just took off, after about 30 or 40 miles of driving the truck cut out back to same problem. now truck will start but cuts out after a few minutes even if it is at idel or if I am giving it gas. also the check engine light blinks a steady and constant blink, any help would be greattly appercated. I am a wood refinisher by trade so I really don't know all of the tech terms that you all use unless it is in my repair book.