I have a 1989 chevrolet p20 van ....It runs rough at idle and really craps badly when I drive it.....I can barely get up to 40mph...can anyone steer me in the right direction to fix it? and also can someone tell me what the little box is that has a vacuum line from it to the egr........I think it may be the egr vacuum solenoid .....the back of the switch has a vacuum line going to the throttle body and then on the front,1 vacuum line going to the egr and the other vacuum port is open with vacuum coming out when the van is started....I dont believe this is hooked up right.....the egr vacuum line is going to the bottom port on the solenoid and the top port is just open(leaking) ?,, but I dont have a clue as to the right way tohook this up.....any help would be greatly appreciated

 

I figured it out....This van has been running like this for almost 9 months and I kept replacing the sparkplugs to make it run better....I called autozone every time to get the gap and was told that the gap was set at .45...............all this time the gap is supposed to be at .35 on a fuel injected motor so I took the plugs out and gapped them all at .35 and put them back in and the van runs like new

 

.035? i havent seen a gap that little since i had to change the plugs on my 69 (points distributors take less gap because they have less power)