Question about 1991 Suzuki Sidekick

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I have a 1991 G16a carby engine, and recently I changed the water pump, so I had to remove the timing belt. When I put everything back I set the timing at TDC on the crank pulley timing marks and had No1 cylinder correctly positioned on the combustion stroke. But now she runs great, then not, then ok, then bad. When it's bad it feels as though it's only running on 3 cylinders and yet all 4 are firing. Also, there is now a tappet rattle from the camshaft above No1 cylinder. Does the timing belt tensioner have anything to do with this? Any help or advice regarding timing and valve position would be very welcome. Cheers Andrew.

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