118* heat... = sudden RICH fuel mixture
 

Its one of these hottest days in Hong Kong now! 35(C) Degrees Celcius, but with 90% humidity = it gets close to 50(C) Degrees Celcius.

Traffic in the tunnels... Water temps gets to about 204 Degrees Fahrenheit (F).

Car was running... than was stumbling abit on the gas peddle. Once out of the tunnel starts getting cool again its was fine again. WHAT WOULD HAVE CAUSED THAT?

I've heard, our AFM temp sensor (IAT) failure would have caused this, TRUE?

It may feel like 50C (122F) to a human, but to a car, 35C even with humidity is still only 95F. Try living in the Valley of the Sun where it's been 110F~115F (around 45C) WITH humidity for the last few weeks.

And my water temps are normally at 210F.

BTW, how do you know you are running rich? Do you have a WB?

Maybe you should be looking at your plug wires, or something else that may be heat related.

Thanks chuck,

Just logging at my NB gauge at now. I would see abit to RICH Spikes.

Just a STUPID question, can you clarify how my Plug wire will be effected?

Depending on how new/old your plug wires are, it could be affected by the heat to where it affects how well it conducts electricity. Bad plug wires = mifires = lurching.

So you do have a WB it seems.

Instead of looking at the gauge, try datalogging. That way you can look at the exact scenario as to when it actually occurs. And when you say rich, what's the AFR?

Also, you may want to list exactly what year/engine you have.