89 cranks and almost starts but engine starts shaking?

[beemo]

hey guys so i tried getting my automatic 325 up and running it cranks almost starting but it starts to shake around and then just dies, tried giving it a little bit of gas and nothing still. Before it died on me i was having idle issues, it would start up strong like nothing but then after a little of warming up it would rev up and down, drove fine except sometimes when i made a right hand turn the rpms would drop and would take a little bit longer to get up to speed, weird? so it would start fine but after me going into stores and coming back out to start it again i would have to give it so, gas after it turned over to get it not to die and just stay on. idk if it has something to do with vacuum seals? hoping that someone recognizes this issue. any advice is welcome and i thank y'all i'm advance.

[4tDX]

My initial thoughts are something with the TPS or ICV.
The Bentley manual covers some very quick and easy continuity and voltages tests you can perform on the TPS, ICV, and AFM.

If that doesn't turn up anything, I would still look at the ICV. Check that the door is actuating correctly. Physically move the gate and see how easily it moves or if it feels sticky.

If that doesn't turn up anything, I would probably end up testing the fuel pressure regulator and/or fuel pump (i believe this MY only has the single fuel pump in the gas tank).

If it is a vacuum leak (someone please correct me) but, with how it is stalling, my first guess would be something after the TV. Or maybe the vacuum line between the manifold the fuel pressure regulator is leaking or clogged.

[ADEN]

The way it turns off slowly as if it is starving of fuel.
Check fuel pump electric connection then check fuel pressure you can try to cut the return fuel (improvise) and let someone crank if it starts ok then your fuel pressure is weak.

[jbontke]

My initial guess is a vacuum leak. The ECU provides enough fuel based on the MAF and a few other sensors. Add a leak in there and it will lean out the engine. What could look like a fuel supply issue could be a vacuum leak. Not knowing what services or prats have been replaced, I would suggest testing the fuel pressure to rule that out then start looking for leaks.