Chevy 3.1L TBI V6 misses

[Meridivs]

On our 200+ miles trip for Easter holidays the Pontiac TS 3.1L TBI engine started to miss under acceleration and lose power uphill.

After a few minutes everything came back to normal and we made it ok to our destination but some misfire can still be heard at idle.

I have attached the audio recording of it
3.1.mp3

If you have encoutered this problem or you have an idea on where we should start troubleshooting this issue you are most welcome!

Thank you!

[Guest]

When's the last time a tune up was done?

[Meridivs]

[Meridivs]

We just changed spark plug wires (Delphi) and spark plugs. Cap and Rotor were changed less than 20K miles back and are looking good.

Old plugs (ACDelco) were good, with no strange deposits/carbon build-up.

Unfortunately car is running even worse now - very rough idle with frequent intake backfires and spitting sounds on the exhaust. Mechanic believes it's an electrical issue more than anything else.

We have a Code 22 on the diagnose interface - TPS sensor low - just ordered the TPS and will post after we replace it.

[SappySE107]

Could be fuel related too.