MY CAR HAS BEEN RUNNING RICH, TOOK IT TO A SHOP AND THEY PULLED WIRING PLUG OFF THE MAF SENSOR AND THERE WAS NO CHANGE IN IDOL. WAS TOLD IT WAS STUUFED. SO I GOT A NEW ONE AND CAR STILL RUNS RICH AND WHEN YOU PULL PLUG ON AND OFF IDOL STILL DOESNT CHANGE. WHAT CAUSES THIS . AS MAF STILL NOT WORKING. OR IS IT ????