Pump spray engine cleaner to find vacuum leak?

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Majindan

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Still having the lean codes with engine light, replaced to small hoses that were literally falling of, reset, and the bastard came back on last night. Engine cleaner is super flammable right? Seems like it'd be easier with a pump sprayer vs a compressed can of carb cleaner to find the air leak. I do have a small plumbers kit with a propane torch I can try as well.

Vacuum leaks are the worse, but I did just read here http://www.yotatech.com/attachments/f2/1362d1064984285-why-no-writeup-cleaning-maf-sensor-maf5.jpg that I didn't clean this part as I didn't know it was there when I cleaned the MAF two weeks ago. There is old dry oil on my throttle body and some oil in the intake tubing as well, never seen that before on my 00' Limited when I had it, thoughts?
 
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