Hi Guys,
I hope someone can help me. My car stumbles when you give it gas. It feel like if I had a carb and its flooded thats what it feels like. This only happen when the car has been running for a while. I did a complete tune up a month ago and I change the fuel injector about a year ago and the stumble does not go away.
I was thinking maybe the coil is starting to act up. Can some one please help me out.

 

Sounds like ignition. Check plugs, wires, cap, rotor, ignition coil... It's possible it could be in the distributor as well, but...no real way to check that. No check engine lights right?

Might as well check fuel while you're at it...make sure you've got decent fuel pressure.

I'd do a vacuum test also. A vacuum leak can make you surge, stumble, and miss.

 

is your tps and iac adjusted correctly?