After reading many posts on the subject, I decided to check my TPS reading and found it to be at 0.27 volts which seemed to be well below what is supposed to be normal. Therefore I decided to adjust it - unfortunately this seemingly simple task turned out to be not so when both of the attachment screws sheared off requiring me to now to have to drill out the broken off screws and re-tap the threads. Does anyone therefore know how to remove the TPS unit from the intake so I can get at the holes - does it just pull off or do I need to remove the intake to access the inside?