2.8L 86 power loss/sputtering/choking
 

My fiance has a 86 camaro 2.8L mpi, she claims this has been going on since the motor was rebuilt about 1-1/2 to 2 years ago... Anyway, if you give it too much gas instead of reving high it sputters or chokes, sometimes it has a 0-20 of about 10 seconds.

Today I tried to troubleshoot the problem. I've been told it could be the mas, but that appears to be fine. other that the symptoms i just mentioned there's also

Idling doesn't hold a steady rpm
I open the throttle and the rpms drop and then increase
transmission shifts late
intake backfires while driving, more while accelerating(enough that i would have to clean the intake every few days to keep carbon buildup out)

other problems that exist are(I don't know if they're related)

Rich gas smell under the hood
Exaust is broken between the catalytic converter and muffler
burning oil
oil leak at the filter seal

I'm thinking its a vacuum problem, but i dont know how to (or have the tools to diagnose/repair that)

Can I get any suggestions? A mechanic shop wants to charge me $20 to plug it up the a computer + $40/hr to diagnose the problem(which from what ive heard could be one or more of many things)

mass air flow scencor and bad pluggs maybe or what went wrong with mine the throttle possition scencor it is located on the throttle body it had a 3 prong plugg in

Fuel pressure regulator... Plugs... Distributor cap nd rotor... Fix exhaust... Run a tank or so of premium through and check vaccum lines for noticeAble breaks or cracking

hey i haad the same problem i changed the two scencors on the trottle body the tps and the idle something scencor u are going to half to find out how to set the idle possition scencor cause if u dont set it right it will start and then the rpm will start to go up into the 1800 range

yah when i had this problem what the car would do is i would turn it on it would idle fine just fine but when i gave it gas the idle dropped and gas fumes came out of the tailpipe so if i pressed the pedel far enough down it would rev high but when u give it gas normally it chokes also a way i way told to check it was the throttle possition scencor on the left side of the throttle body it has a little flipper with the car on press this flipper on it and if the car reves down u know its bad it will send bad reading to the ecm ans act up