Ok. I'm not sure how to explain this but I have an 87 8v. I'll start with that the cold start works very badly it takes a while for it to able to idle at all. Like a few cranks. The first few would be crank fire up rev then die. And then will go crank fire and idle a little and then die. And then if I give some gas to idle a bit higher for like 5 seconds it will be ok to drive. But after it starts to warm up the idles to dip. Oh yea it idles high too. Like at 2k. So it starts to dip from 2 to like 1200. But still stays on. So when I drive it kinda like dips while driving. I'll be going and loss all power and the throttle won't response. Just the engine dipping to a real low idle and not doing anything til I clutch in and rev it. And once I get it going. It'll like jerk like the engine loading revs. We first thought it was a vacuum problem and it did have a lot of bad lines but I replaced almost all of them and it hasnt gotten better. I think if might be a fuel thing. Any ideas? Thanks. Of you need any more info let me know. Its strange to explain.