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I tried just cleaning through the vacuum line, wasnt really expecting too much out of it, and other than polluting the neighborhood, didnt seem to help resolve the issue. I broke down and ordered a fuel injection canister to try to address the injectors directly, but it wont show up for a few...

I have seen something online regarding the needle vibration issue..One of these days I will address, assuming I ever figure out current P300 issue. Lester, I think my fuel pressure is about 50+ psi, can you tell me why you think its low? I was under the impression that 50 psi was right on...

I think I saw a youtube video using the vacuum booster for the brakes.. I will consider that. But the fuel port you are talking about, is this the same fuel port where I connected the gauge to take a pressure measurement to make sure the fuel pump and filter were behaving properly, or is...

Also, I checked the air filters.. like new. And I believe we cleaned the mass air flow sensor before, but I did it again this morning. Did not improve performance.

I am having a little trouble locating a cleaner that connects to the fuel rail. I see a 3M product and Seafoam, that seem to be intended to use on the throttle body, which seems pretty straight forward. I have found a pressurized cannister system, one from Fit Tool out of Taiwan for about...

So I played with the IR gun. It may have still been warming up, but the temp gauge was at about 170 or 180, I forget which. I think I have stock thermostat in there, but not positive. Anyway, the temperature profiles of both sides seemed the same for the most part. There was about a 10...

Ok, so I just came in from messing with it some more while you were responding. And thank you for responding first off. I do have an IR Gun, so I will check that. For the oxygen sensors, do I need to scope them? No scope here unfortunately. Thin morning, I finally checked fluids and did...

Service Manual Unfortunately.. dont have one of those, been looking online..but so far, have not found it.

Oxygen sensors reasons. Currently, I am using a scan tool and graphing the output. Since I have a very rough idle, it seems I should not have to collect data for anything other than idle, just to simplify things. I plotted the data collected for 1 minute, but only seemed to have about 50...

99 Tahoe LT, 350, V8, stock with 145k miles. So I have a P300 Code and the vehicle is running really rough, and seems excess fuel getting into the exhaust as I can hear popping and such. No visible evidence of oil leaks that I can see.I do think I notice the fuel gauge needle vibrating more...