Pulsating Idle

[tjh]

During a high idle episode , I pulled the plug on the TPS while the engine was running,and the idle immediately returned to normal.

Could the TPS be the culprit?

[Grif]

During a high idle episode , I pulled the plug on the TPS while the engine was running,and the idle immediately returned to normal.

Could the TPS be the culprit?

I would say quite possible yes. I replaced mine when I was having idle issues, easy to do and a cheap available part, so its an easy enough test.