This does seem to have the hallmarks of the valve timing being out. Can you turn the engine over by hand on the crank pulley and see if the holes in the cam pulleys line up? I can't remember if there's a TDC mark on the front cover anywhere (TDC for number 5 cylinder) which is where you lock the crank when you change the cambelt.
However if you can't the 4 holes (actually a hole and a slot on each cam pulley either side of the centre bolt) to line up horizontally like they do when you fit the cam locking bar, then something is definitely out with the valve timing.
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