Its a GT. Motor wise i havent done anything to it besides clean out the IAC/TB. I recently installed magnapack catback and BBK O/R H pipe. It was throwing codes before the exhaust. As far as i know the timing is stock. Havent checked and dont know how to. I got it from an older couple who had it allllll original. He changed the distributor some years ago, so its possible the timing isnt correct. Im almost 100% sure the wires and plugs neeed to be replaced. As well has the fuel filter, more than likely the filter is factory. I dont know what FPR stands for lol. Fuel pump and injectors i dont know either how can i check? and how do i run a pressure test? I will take a look at the MAF and air filter by this weekend. And it doesnt seem to have an vacuum leaks from what i can see. And i believe it threw 176, 181, 186, 189 engine codes.
So how did you come upon this issue? Did it turn on the CEL (Check Engine Light)?
You should be able to borrow some tools to check the timing and fuel pressure. Check with your local part stores, they will typically have loaner tools.
For the timing you'll need a timing light. Hook it up according to instructions, disconnect the 'spout', and aim the light at the harmonic balancer which is below the water pump pulley on the alternator side. Lots of YouTube vids on how to do this. You're looking for the timing to be 10* BTDC, can be as high as 14* for a little performance but no higher or lower than 10.
Fuel pressure just needs checked at the rail. You can get a permanent gauge which goes into your rail's schrader valve, or a test gauge which you'll install for the test, then remove when done. You want to do the test with the vacuum line removed from the FPR (fuel pressure regulator), it sits on the passenger side of the fuel rail closer to the firewall. You're looking for about 40psi with the vacuum removed, will be less with vacuum connected.
Definitely check the vacuum as well. If you have a leak somewhere it can definitely cause the issues you're seeing. Biggest leaking spots are PCV, cracked plastic connectors/tree, brake booster, and the intake manifold.
Hope this helps!