1987 k20 TBI Starting Problems. I know another "starting problem" thread

[WuchaGot]

Howdy folks, New to the forums and just picked up my first Chevy truck and having some issues and looking for some advice.

I picked up my uncles old farm truck that was garaged about 5 years ago when my uncle bought his new truck. We rented out the house that the truck was stored at 2 years ago and the truck was moved outside. When it was moved it started right up and they used it for a harvest then it was parked outside with the trailers where it has sat for 2 years.

I bought a new battery 2-3 weeks ago and hooked it up, sprayed some started fluid in the throttle body and after about 3-5 min of working at it got it running and it sounded good. I did a full maintenance a couple days after I got it running (new cap, rotor, plugs, wires, oil change with synth blend and a bottle of lucas, auto tranny filter, lucas branded tranny fluid, thermostat and coolant temp sensor)

It was a VERY hard starter the first week but it began starting easier so I figured it had just been sitting and was a little stiff and running it would be good for it. When I drove it and shifted it into drive or reverse it would bog down a lot, sometimes it would bog and die other times it would bog and recover. When I drove it and pressed the accelerator it would sometimes roar down the road with tons of power and other times it would choke and die. 2 weeks ago outside temps started dropping into the 30s and I went out to start it and it would crank but for the life of it it would not start.

I know all the sensors and modules make changes based on temp and little things can cause big issues and the bogging was making me think fuel issues, it had been sitting for a while so the fuel could have been bad. I pulled the fuel filter and blew through the inlet and could hardly blow through it so I replaced it. I changed a bunch of clogged vacuum lines but 2 ports on the throttle body were gummed up solid so I took the throttle body off and did a FULL clean up and rebuild (Fuel pressure regulator, new idle air control valve, new rings, seals and gaskets. I used the same injectors, they were fine). I had my wife crank it over while I shot a light at the injectors and they were spraying nicely so fuel is no longer my issue but still wouldn't start.

Now I am looking at ignition issues I guess. Any advice or typical issues with this make model that are common? I have ordered a new ignition module and coil. I am also reading that the ECM can go bad. My wife is pissed. Bought the thing for $700 and already put $500 trying to get it running and she is thinking I bought a lemon. LOL

My uncle is a maintenance fanatic and wont let the oil get near 3k miles old before changing it and because his vehicles are important for his livelihood it's cheaper for him to spend money to maintain his equipment then to loose money because his equipment goes to heck in the middle of harvest. He parked the truck with a fresh oil change and blocked the wheels so the tires wouldn't decay. He had the engine professionally rebuilt about 53k miles ago and the tranny serviced before parking it. The fluids were all as clean as if they were just changed the day before but I changed it all anyways.

Thanks in advance for any advice. God Bless