I'm running out of ideas..... Any input?

[CarIsDrivingMeCrazy]

While my truck is in the shop I was using my dads car. Within a week of using it, it starts messing up. It seemed like it was struggling to get air so I took it to the shop they said that the Cadillac converter was stopped up, so they punched it. I picked the car up and got down the road and it was still messing up. The shop kept it for almost 2 weeks trying to figure it out and they couldn't. I'm just happy he didn't charge me for all the test ran.
Here's what I can tell u about what's going on.
*gotta pump gas twice then hold for it to start.
*Runs and idles good when cold.
*(at first) When motor warms up only in drive it would hesitate like if it's not getting fuel.
*(Now)after motor is warm it does it in park/neutral if given gas
*Stalls if driven or given gas then left to idle.
*Has good fuel pressure
*Jets are not pulsing as much as they should
*fuel filter was replaced 3 months ago
* all plugs and wires are good
* I put a new distributor cap and rotor button on when I started using it because that has given problems before so I changed it out.

Let me know if you need any more information.
Any help is very appreciated!

[frapjap]

Welcome to NICO! Sorry to hear that your car is having trouble. I'm not all too well versed in your vehicle, but can offer an option for you.
Here at NICO, we have Factory Service Manuals available free to members. Take a peek at the link in my signature and find the FSM for your car and you'll have all the info to diagnose it for yourself to see if you can find anything they missed.

Some things that come to mind for me are:
- fuel pressure regulator
- check for vacuum leaks. Do this by getting the car running and spraying carb cleaner around any and all vacuum hoses (one by one) and listen for the engine to rev up. If it does, spray again and isolate the area and potential hose. Replace it and see if a difference is made.
- timing. Get a timing gun and check it out to see if you might've thrown off the timing with the new cap and rotor.