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Ok, thanks for all the help

I did record the sound on my phone, not sure if there is a way to uploaded on here so you can here it.

The sound seems like it's coming from the front of the motor( where the belts and pulleys are). It sounds like a bad belt but it's not the belt. Would a timming chain make this kind of noise? The motor runs good. Thanks for the reply

I took my tahoe to walmart to get a oil change and they put 5w30 synthetic oil in. After I got home I was hearing a loud chirping sound from the motor. I replaced both belts and still had the sound. I took both belts off and still hear the sound. It's really loud at idle and I can hear it when...

I have replaced the plugs, wires, coil pack, fuel injector and the 02 sensor. The mechanic told me that the 02 sensors should be reading close to the same #s but the one was reading a lot lower then all the others. I'm taking it to a shop next week to have them look at it. I have heard a lot of...

I had a mechanic put one of them high tech scanners on it and he noticed right a way the bank2 sensor 1 02 sensor is reading all over the place. The other 2 02 sensors are reading close to one an other but the bank2 sensor is not even close to the others. He said that could be my problem. Have...

Could it be a vacuum leak? If so is there a diagram showing all the vacuum lines on the 5.3?

Well, I tried it with brake cleaner and I did not hear any change on the misfire. If I take the car to a chevy dealer would they have a scanner that would tell me what's going on. I know the scanners that autozone uses will just tell me the code but will the higher end scanners dealer ships use...

Ok, I will give that a try tomorrow. Thanks a lot this misfire is driving me crazy. I will let you know tomorrow what I find out.

Is there a way to test that?

Yes I did clear the code but after driving it it came back. I switched the coil pack from cylinder 1 to cylinder 3 to make sure it wasn't the coil pack. The code still came up saying it was a misfire on cylinder 1 so I know it's not the coil pack I put on.

I had a leak test done the other day and they said it was 8%. They said the test shows it's with in gm standards.

06 Tahoe with 5.3 cylinder 1 misfire Update on what I have done to try to fix this misfire. I just replaced the fuel injector on cylinder 1 and still have the problem. Does it take time for the car to learn the new injector or should it run fine right of way? Thanks for any help this misfire...

I forgot to say that. I had a pressure test done most of the cylinders had 160-165, cylinder 1 had 145

I have a 2006 with the 5.3. The check engine light came on and went to auto zone and they pulled up a cylinder 1misfire code. I replaced the plugs gap at .040, replaced plug wires, cylinder 1 coil pack, cleaned throttle body and ran locus injector cleaner through it. I still have the misfire...