Exact same problem my friend had last week with his 95 Z I'm now having with my 94 Z. I have a 1994 Z28, auto, under 78,000 miles. Two days ago Im getting on the freeway, as I hit the gas the car had no acceleration at all and was lacking power. I had to gradually apply gas to gain speed. When the car is cold its fine after it warms up a bit I cant punch on the gas anymore, just a little at a time.
So I took it to the dealership this mourning and they performed a few tests. This is what they said: They found no trouble codes. Fuel pressure was good. They test drove the car, back firing (which I never heard) and no power seemed like it has a plug catalytic converter.
They checked the exhaust back pressure and that passed test (it only had 1 psi but still in spec).
They recommended a leak down test for possible sticking valves (cost $270.00)! also recommended replacing spark plugs and wires.
So my question is which should I do first? Plugs and wires? catalytic converter? or this $270 leak test?
This could get expensive so I'm trying to narrow it down. Any help would be appreciated, thanks

Ronnie

 

plugs and ,if u have it in ya, wires. major pita. and a fuel filter if u havent changed it in the last couple yrs. when u change the fuel filter dump whats in the filter in a jar so u can see if theres any water.

 

yea okay thats what I was thinking i should should do first. Plugs and wires.