Quick story, might help others .
pretty sure my TPS went bad. Replaced it , worked for a bit and then went 'bad' I read many threads on different forums where by people have had the same issue and kept replacing them untill one worked out. I thought about this a lot, and yesterday went and took my throttle body off and had a good look around. In the end I found that the throttle shaft was being pressed all the way to the back of the TPS drum , the TPS could not always fully return to zero, even when the throttle had. I found two small washers and inserted them on the TPS bolts between the throttle body and the TPS to space it out.
Worked a treat , not a single friggin problem anymore !! Couldn't believe what this was in the end and glad I worked it out and didn't waste money on more throttle sensors . All the best. Ant.