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Thought I would post the latest in my saga to eradicate P0121... conducted a VERY thorough cleaning and used the grease as suggested. So far, code gone however the start up issue still exists. I am thinking fuel pump/filter now. I'll tackle that tomorrow. My new issue is idle. Its all over the...

Any results? The test was schedule for 5/15 right?

Thanks clkelly. I have cleaned all connections one last time related to the MAF, TB and the sensor on the pedal (APP or APS if I'm not mistaken). I used CRC electrical connection cleaner. My TB was nasty once I removed it. Last time I just wiped out what I could and sprayed a can in it so maybe...

I agree with clkelly - I have done this multiple times, no dealer was needed and idle returned to normal. However in my case, I still have the P0121 problem so who cares what I say anyway :whymewhyme:

No luck - Help! Thx CLKelley but that has been done, several times. No change. P0121 code is back with a vengeance and hard starts. Latest - I have replaced the MAF, spark plugs and wires, no change. I checked the Fuel Pressure and it slowly comes up to about 48 upon startup. When I...

How was it? Results? I am thinking of doing the "Scan Cable Tune". Just curious if you have seen any improvement.

2007 4x4 w/105k

2006 Trailblazer SS

Hi all, I have a 2007 Tahoe w/105k. 5.3L. I have made no mods except a K&N air filter. First issue: About 5k miles ago I started to get a P0121 code. After researching this, I came to the conclusion to clean the MAF. I did this, it worked for about a week. I cleaned it again, it worked for...

I have seen the same thing. And now my gas mileage has tanked after cleaning the MAF. What were was your final result? Did you replace it? Clean it? Just curious. I am about to replace my MAF.