Two things to check.
1. Vacuum lines, make sure there all connected, if they are check for cracks in the lines.
2. Under your seat you will see a black box with two rows of wires, check to make sure none on the wires have broken. I has a similar problem way back and it was a black wire to the far left on bottom row, you will have to pull the box to make sure all wires are in tack.
I replied this once, but for some reason I didn't see it, so here it is again, hope it helps.
If you still have a problem let us know, and we will try something else.