First timer ! I have a 2002 2.5 FI on my gyroplane. It has purred for 200 hrs over 12 years, It sat unused over the winter ( same for the [past 12 years ). On my first long taxi, 10 days ago, the engine coughed and sputtered. It ran smoothly from a cold start until about 150 degrees water temp. The it had trouble between 1,500 and 2,000 RPM. A friend had a code reader and we thought the problem was the Throttle Position Sensor. we installed the new TPS yesterday; no help, no fix. We pulled off the Idle Air Control ( it looked fine but not sure what to look for. I am running with 2 fuel pumps; one is full-time, the other is a switchable aux. It seemed to run a bit better with both pumps ; certainly not smooth though. Anyone had a similar situation ? Hope this is a proper area of the Forum. I tried in Engines, but it said I could not start a new topic. Thanks in advance for any help. Tom T. in MN.