I have a '97 VR6, I've just changed the cam chain tensioners myself. But when i got the car back togehter and running, it miss fires until about 2500revs!! My question is: is it possible that i have moved the timing one tooth on the chains even though i didn't remove the chains, would this cause it to only miss fire or would it be likely to hit the valves? Also is it possible for me to check the timing marks or change the timing without removing the gearbox again!! Or is this it possible that it's just the inlet manifold gasket as i never changed it, but it looked perfect!! Someone please