Ok so here is the problen my astro van has a chx eng light on van will not start on its own. I bypassed power to fuel pump so pump is running. still wont start but when i prime engine will start and run , BUT low power and on acceleration van hesatates and surges . van runnes good to about 55-60 chevy dealer said 250.00 to get it on the computer thats way to much any Ideas