Question about 1990 Toyota Corolla

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Hi. I have my toyota corolla 90 dx for 2 weeks now from the seller. It was fine, just a little shaky. First time u put gas it was fine for a day but next day i took it in the highway, did speed a little but next they it was rough idling and i hear knoking soubds when i put it on drive. It became slow at first, delayed shifting but after i go hway its fine, up until i stip again. I ran stp heavyduty gas cleaner first tank and redline on second. Didnt fix problem. Please help thank you

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A couple of things come to mind here. First, check with the previous owner and find out what octaine number gas he was using. If you are using the wrong octaine gas on a high mileage motor you can get the knocking sound. Second the rough idling may be a vacuum/air leak. Check all your air hoses and connections. If you find any disconnected hoses look for an empty connection. If no connection plug the hose and see if that helps.

Posted on Feb 17, 2012

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