I have been having power issues with my 03 Escape, 295,000 miles. I had codes P2195 thru P2198 come up, codes for rich and lean readings from banks 1& 2. I changed the plenum gaskets, tested the MAF sensor, which tested bad. I replaced the MAF, still having some power issues after shifting into 2nd and higher gears. Now, I'm getting a cricket chirping sound that seems to be coming from the passenger side dash, and only at higher rpms while driving. Nothing while reving the engine in park.

Any ideas or suggestions? MAF sensor replacement has helped, but it was not a cure.