Well I was thinking you could have messed up the valve timing while you were rolling in the new chain. The quick and easy way to check is to line up the timing marks on the cam and cam tower and reading the degrees on the crank.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL