1990 Chevy Lumina just stopped running, while driving

[Xyden]

Hey everyone. First post on here. I was hoping to get some help with my car because my mechanic can't seem to figure out the issue. So about 3 weeks ago, I was driving down the road at about 55 mph, on cruise control, when my car just started slowing down. I looked to see all of my dashboards lights on and I realized my car was not running. I shifted into neutral and the car started right up again, but when I pushed on the gas it just kind of stuttered and shuttered before dying again. When I came to a stop, again the car started right up, but repeated the shuttering and hesitating when I pushed on the gas and tried to get going again. So, I repeated, but this time i just pushed very gently on the gas, getting up to between 5-10 mph before the car died again. At this point, it just stopped running completely. The engine would turn over, but would not keep running. When I got it into the shop, the mechanic said they put a fuel pressure gauge on there and the readings indicated that there was plenty of pressure, no problems the fuel pump or lines. After further research, the mechanic said he thought it was an electrical problem, that it could be the crankshaft sensor or the ignition switch module, but he just did not really know for sure. I had him replace the crankshaft sensor, since it was the cheaper part, and it didn't fix the problem. So now I am just kind of stuck on what to do here. Does anyone have any ideas?

[maxwedge]

First question is do you have spark to the plugs when it won't run, ign modules were very common on those cars as well as crank sensors and ecu's. Post back results of spark test.

[Xyden]

UPDATE: So I just spoke to the mechanic and he said that the car will start and run for a few minutes, but once it's warmed up, it just dies. No misfiring or running poorly, then dying, it just shuts down. He seemed to indicate that the spark plugs were working fine.

[maxwedge]

He should be able to diagnose this on the spot, no? If spark is good then it is either running out of fuel or no injector pulse.

[GTP Dad]

I suggest possible crank position sensor failure. When they are cold they will often work properly and then stop working after they warm up. Most of the time they will not show a code on a scanner. Also it is possible that there is a crack in the ignition module that is heat sensitive and once it gets hot it stops working. Just a couple of ideas.