Engine Problems - 5s, can anyone help? Options

[Wyotech6GC]

I started my car last night and the RPM got up to normal idle, i put the car in reverse and as i let off the clutch and started back my RPM's dropped and the car shuddered. When i pressed the gas harder it continued to drop, the problem stopped after about a second, so i thought all was fine. I started down the road and 1st gear and 2nd gear ran fine, i shifted into 3rd and the car got to around 2k rpm and wouldnt go any higher, regardless of how hard i pushed the gas pedal, i thought i lost 3rd gear so i down shifted to save the car and it shuddered even harder. Now, with the car dead in the middle of the road, it tries to start and one cyl. fires then dies again...idk where to start and have got many opinions including fuel pump, fuel filter, timing, and a bad cam, i trust people on here more than the morons down at autozone...

If anyone could help, it would be much appreciated

Thanks
Ryan

[Wyotech6GC]

A whole new set of problems has just arised, come to find out it was a bad vacume line to the engine is why it wouldnt start up right, it ran and idled fine until i tried to hit the gas and go, then the rpm's drop down, if i can manage to get the RPM's over 3k it runs fine until i push the gas to the floor... im seriously stumped as to what it can be now...