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Volvo causing pain 900

Here's the latest!

I went to the salvage yard and was able to find an overdrive relay which seemed to fix the overdrive problem or at least the arrow light is acting in accordance with the switch. Can't get the car fast enough to test overdrive yet.

I cleaned the IAC and have had a strange idle ever since. The car will have a high idle and then lower to about 500 rpm then back to about 2500 rpm then back to 500, etc.. I took the vacumm hose off of the intake that goes to the IAC from the large hose that goes into the throttle body and restricted the airflow out of the hose with my hand. I could cause a steady idle at about 750 acting as the air flow controller. Do you think the IAC is bad after cleaning?
Maybe the Throttle position sensor should be re-adjusted?

Car will still not accelerate at all? Any other ideas? I've checked and checked the hoses for leaks and a small leak may make the car run a little rough but not totally destroy the acceleration. Could it be the fuel injector relay? What does that control?

Thanks again!






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