I think I need either a new tps or tp switch. I know what a tps is but never heard of tp switch. I have code 133 on my 90 740 turbo. I have major hesistation under boost and not under boost so either one of those is giving me the problems

 

Are you sure one of the intercooler hoses aren't collapsing?

 

how do I check to see if an intercooler hose is collapsing under pressure?

 

Put the car in gear with the E-brake on. Give it some gas with your foot on the brake as well. Have someone watch the hoses and see if any of them collapse when the car goes into boost.

 

I should of thought of that will do that tomorrow thx