i have a '91 2.7 which is causing me some headaches. on cold start all is fine, idle is approx 7 -800 rpm. if i pootle around, no probs at all. if i press on a bit, hit maybe 6k in second/third when i slow to idle it gone up to 13 - 1500 rpm. if i kill the engine then restart it goes searching from 1000 - 2000 rpm before settling back to 13 - 1500. seems nothing is showing on diagnostics and recently had new o2 sensor and throttle body. stumped
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