Ok guys. I have an 87 turbo coupe that was converted to 5.0 t5 along time ago. I've daily driven this for over a year and recently something strange started happening. Every now and then the engine will rev itself. Sometimes while I'm sitting at a light bam it will just shoot up to 2500 and stay there. I Cleaned the iac and no change. I set the tps no change. I replaced the tps no change. I didn't change anything and it isn't a vac leak. When it's happening if I turn off the engine and remove the key and restart it will go back to normal. I'm stumped. Any suggestions?
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