toomanytoys
08-21-2005, 10:31 PM
I just bought an 86 toyota pickup off of my buddy for a good gas mileage truck to get me back to forth to work. He told me it needed new plugs, but when I started driving it, it seemed fine. It had plenty of throttle response, and would sit at idle all day long.................until I was going to my girlfriends house this weekend. She lives about 40 miles from me which requires alot of highway driving. As I was heading down 95 it bucked a couple of times when I got on the gas. The further down the highway I progressed the worst it got. It got real bad up any sort of hill. It would buck like a bastard. I changed the plugs today (the old ones looked fine), and took it for a ride with no problems.....................until I was again on the same highway heading home from my girlfriends when it started. I even sat in about twenty minutes of bumper to bumper traffic with no problems. It seems to only do this when it's been running for an extended period of time. As soon as I push the clutch in while its bucking it idles fine. Once the bucking starts it gets really bad when it's under a load. I'm thinking it's the cat. I had a new muffler and tailpipe installed the other day, but the cat. is original. Any info would help!!!!