Hi Scotty.

Hope you are well.

I have a 2006 Opel/Vauxhall Corsa Lite 1.4L

I'm experiencing high idle issues +-4k RPM at idle

I noticed my earth/Ground wire was bad , so I changed it. Still the same , I removed the tps Sensor connector idle dropped to +-2k RPM. 

No check engine light came on prior to removing the TPS sensor connector , once removed , the engine light comes on.

I then cleaned the Idle Control Valve , no changes (prior to removing the TPS Sensor connector)  and also the the throttle body. 

I checked for vacuum leaks , didn't find any - all hoses from the MAP Sensor till and MAF Sensor - no visible hissing / leaks , sprayed soapy solution as a contingency plan to check for bubbles , nothing. 

Car has about 150k Kms mileage or around 90k Miles on it. 

Put it on a scanner , no faults thrown. 

Car is my daily to work and back and I'm feeling the pinch with fuel economy.

My questions are

What can I look for? 

What will cause the irratic idle?

What is your best solution? 

I don't want to spend thousands of Rand's (I'm from South Africa) on obsolete parts. 

All the mechanics here either give the same story or a different one. 

Please advise as it will be greatly appreciated. 

1. Love From South Africa. 

Fahim