on 1 and 2 cylinders the pulse on the jectors are hard.3 and 4 is weak.the idle is a little rough.does anyone know why? plus sometimes i get a code 20.

 

Go here for some ways of checking that Code 20:

http://geocities.com/chipman_13/sens...shoot.html#ELD

Are the plugs uniform in color?

When was the last time they were changed, along with the plug wires?

What do you mean by "hard" on the jectors, are they clicking more then the others?

 

thanks for the site,ill see whats going on today.