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Message: <blockquote data-quote="74delta" data-source="post: 1579925" data-attributes="member: 37944"><p>Hey everyone new here and just picked up a mustang. I've always been a fire bird guy and wanted to try something new and picked up a 95 gt very m5. The car has some modifications like full shorty headers back, trick flow intake, CAI. I noticed some pinging and a rough idle when it would get to around 180 degrees so I looked into timing and it was set at 17 degrees base timing. After researching on this site I saw factory was 10 so I followed the procedure and set it at that and did a base idle reset. Low and behold the car idling seemed much happier but was noticeably less peppy. The previous owner told me he always ran 93 octane and figured that was just because the 17 degrees of base timing so after I set it at 10 I tried throwing 10 gallons of 87 in it. The car at 10 degrees of timing running 93 might be the slowest car I've ever driven. Runs/idle great but has the power of a 3 cylinder geo metro. Should I bump the timing up to say 14 and run premium and see if it pings or is there something im missing? Its crazy the power loss but again runs well.</p></blockquote><p></p>