Shoedog

I just bought a 93 z28 manual trans. 70k miles. The car doesn't pull anywhere close to what it should. Struggles to rev past 3800-4000 rpm. It starts great and never dies, it's just weak. It is totally stock. Any ideas more than welcome.

Injuneer

What happens when it hits 3,800-4,000 RPM - misfires, total loss of power, or keeps running, but just won’t go past 4,000?

Has it been checked for a plugged catalytic converter?

At any point have you scanned it for codes, or checked the fuel pressure?

Shoedog

The car runs past 4000, it's just sluggish. Revs build slow.
I haven't checked anything (bought it last night). I will start a checklist of your suggestions. Thank you!

shoebox

A weak coil can also cause weak performance.

Shoedog

Is there a way to test the coil?
thanks guys

Shoedog

SOLVED. The fuel was over a year old. I drained the tank and put in premium. HUGE difference. Thanks for the input y'all.

Chimera96

consider changing the fuel filter now