I'll like to know the symptoms of faulty Mass AirFlow Sensor.
My car has 252,000 miles and recently when I decelerates, the rpm drops down to 300 and sometimes the needle fluctuates up and down which cause the car to vibrate. I haven't check for any codes but according to online, MAF might be the culprit. I cleaned the MAF this morning but still has no luck.
How do I check for broken MAF w/o checking for codes? and what else can be the problem?

 

Why haven't you checked codes? Is there a reason you want to diagnose your problem while specifically ignoring any codes you may have?

That doesn't make any sense. Check the codes, report back.

 

TPS?,VSS? CEL on?

 

GET A OBD SCANNER OR TRY ADJUST YOUR IDLE SCREW

 

go to autozone, have them read the codes(its free) post up your findings.

if it wouldnt rev. above 2k i would call it maf for sure, right now i can be a couple things.

 

it sounds like a MAF i would unplug the sensor and see if it runs any different and go to autozone and get those codes pulled

 

Clean the TB and the IACV, at 252,000 they are probably pretty gunked up.