Hello, I have a 1988 5000 that won't turn start. I tried jumping it, but no success. It won't even turn over. The last time I was driving it the "ABS Off" light came on then went off & the rpm needle started bouncing. Then power went down like it was running out of gas, then back to full power. Got home & parked it, tried to start it the next morning & nada. Ideas? Thank you!