99 Sportage that has me puzzled. Symptoms Stumble off idle and no power. You can drive it just fine but it feels like it is down 20hp. I had codes checked and I have 2. I have code p101 and p172. IÆm pretty sure p172 is O2 sensor. I have been trouble shooting the p101 all day and IÆm out of ideas. So far I have done the following:

Soldered connections to eliminate plug

Tested voltage Per Kia global Service instructions
1. Warm up the engine to normal operating temperature and let it idle.
2. Connect a voltmeter between terminal 4 (RED/GRN wire) and ground.
3. Verify that the voltage varies between 0.8V-1.2V.
4. Rev up the engine and verify that voltage varies between 3.5V-4V.
5. If the voltage is not within specification, replace the mass air flow sensor.

#3 I have 1.3V
#4 tops out at 3.5V as I rev engine

I pulled out ECU and checked for continuity between MAF and Pin 14 and pin 41 and everything checked out.
I tested the TPS for resistance and it is in spec 2.4 closed dropping to 1 as opened.

IÆm willing to try just about anything but have run out of ideas. Any thoughts would be welcome.