Another product ya might wanna checkout is Seafoam>I used on an old chevy 305 with alot of sludge=I dumped a can in the crankcase with it running and idled it about 10-15 mins.Then did an oil and filter change=the crud that came out was phenomenal.The engine lifter tick went away but it ticked all the time not just cold.I 've used Seafaom alot especially as an intake cleaner but not direct contact with maf etc sensors>it will clean o2 sensors if the gas in your area is bad=my neighboer's 2004 maxima threw an o2 sensor code=ran a tank through with Seafoam in it, and reset the light=has come on yet in 2 months.DAMN I OUTTA GET PAID FOR PRODUCT SPONSORING.Works better then lucas at cleanin the fuel tract in my opinion.Good luck in yer endeavors and peace out.

 

Ya could try Gunk Motor flush,but warm the engine up then add the flush let idle for 10 -15 mins then change oil and filter.the Seafoam stuff works good too like the Gunk Motor Flush just don't drive or race the engine with them in it.