Originally Posted by
total_vauxhall
First of all take the intake plastic top hat off look in the center of the carb you will see a brass jet unscrew this out with a flat screw driver make sure its not blocked with water or white fuzzy shit . 9 times out of 10this jet causes a problem . Failing that fire the car up and why its running spray wd40 all around the inlet manifold gaskets see if the revs change could be a leaking gasket hence why it only runs on full choke . Then remove the dizzy cap and make sure the rotor arm is good and not burnt on the contact . And check the inside of the cap . These motors are very basic and not realy alot that can go wrong so I wouldnt be to worryed. Check the vac pipes on the carb are not split .