PulpFriction

Ah, yes, It’s a 2010, isn’t it? Well, might still be useful for future reference for someone without RPD.

Also, shoulda mentioned trying some racing fuel. Although hot carbon might still preignite the fuel, detonation is less likely.

RBodeman

Its been a few weeks since I updated this but I was on vacation at the end of August and then been busy catching up with work since. But unfortunately the issue continues at similar frequencies.

I checked for codes and there are none.
I pulled all the spark plugs and all are AC Delco Iridium 41-108 and the condition of all 4 looks good.
However the ignition coils are not AC Delco. They are Autozone Duralast. They have been in the car for about 20k miles
I set the RPD to Spark Advance and noted the following when the issue arises. Spark advance will be at about +20 when lack of power issue is occurring. But after the pedal flick and full power is instantly restored, the spark advance will be at about +5. The only time I will see a negative (-) spark advance is during the warm up after a cold start.

Any ideas or suggestions what to do next?

Rich

Oldblue

Get rid of the AZ coils!

PulpFriction

I wonder if this could be a bad throttle position sensor.

RBodeman

I am thinking this also.
I had problems with the Duralast Purge Valve. Switched it out to AC Delco and problem was resolved. Duralast seems to have problems with their electronics.
What are the recommended coils?

RBodeman

How would I test this? Is it something that can be cleaned?

PulpFriction

IDK how it works. I was fishing for someone with more experience with that system than I have. You could look into the price of a new part. But I don’t even know if it could be the sensor at the pedal or at the throttle body. I just think if flicking the throttle changes the behavior, then a mechanically sticking sensor is at least plausible. If no codes, I would lean toward the pedal sensor, cuz how’s the ECM supposed to know what yer foot is really doing?

Oldblue

A dirty throttle body is more likely. Let’s not load the parts cannon!!

PulpFriction

I agree. A sticky butterfly should generate a code, but I dunno how the sensor works. I went scrolling up to see if cleaning the TB had already been done, got interrupted, and just now came back.