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Message: <blockquote data-quote="StangGrin" data-source="post: 1206041" data-attributes="member: 16391">Hello again all,Man...this project (1999 GT 5-speed NA) is going to keep me always posting for help with issues.So I got the engine and tranny back in and all together. When the engine runs it's rather rough - way down on power. I can tell it's missing.  It will also backfire through the intake every so often. I'm rather certain I was quite particular when I installed the timing chains.The chains slipped when I replaced the guides. So I pulled all the followers, put timing marks on the chains (by folding chain in half and marking each end), and installed the chains with the cams at 12 o'clock (driver's side) and ~11 o'clock (passenger side) and aligning with all timings marks. Then I put the followers back in where I could. I rotated the crank (CW as I looked at it from the front) to give me more room to install the remaining followers.The thing I'm wondering is if I have a chain off by 1 link would it run like this?I also replaced intake manifold gaskets - could that cause backfires?Looking forward to sage advise...again.</blockquote>