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I would continue to look meticulously for a vaccum leak, they are very hard to find sometmes, they only occur when the car is pulling more vaccum under load than it is at idle. Trust me, I just went thru all this with mine and finally found a tear in my AMM to Turbo hose that caused an vacuum leak only when the car was under load. You really have to feel or pull off every single hose one by one and replace ANYTHING that remotely indicates there may be a leak.
Cleaning the TB Intake like he said will really help alot too..
It takes a while to get used to using the FAQs but, they are really excellent.
I would if I were you,
1) Clean the TB Intake and replace the TB Intake gasket. Follow the FAQs.
2) Inspect every single hose inch by inch in the vacuum system. They are a bitch to find sometimes. There is no eay way to find these things, it takes time and patience. A real PITA
but, it's a rewarding experience when you do find it ! ! LOL !!
Do number 1 & 2 and then post the results up here. If 1 & 2 don't fix your issue then we can look a few other places. While you are doing the TB Intake, manually rotate the throttle and make sure you hear a very slight click as soon as you rotate the throttle. This will confirm that the Throttle position sensor swicth is properly adjusted. You need to lean right over and put your ear next to the switch when you move the throttle off of it's idle position. You'll hear it click, move it very slowly don't just yank it open and let it snap back and expect to hear anything.
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Rich George
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