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How could tightening down the tappets too much cause such a problem? I set the inlet and exhaust clearences to there correct values when cold then tighten the nut fairly strongly to ensure the vibration of the tappet doesn't cause it to loosen. I then recheck the clearence to ensure the tightening hasn't adjusted the tappets further.
How do I check for air leaks in the vacuum system?
I'll get hold of a battery from another car to test that theory as soon as possible. Today I noticed it trying to idle below 500RPM consequently cutting out, this is out of spec as the ECU should keep the idle in drive within the 550-650 RPM range. Perhaps a sensor is too blame?
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