I have a 94 Dodge Shadow 2.5L EFI single-point fuel injection. The car has 190,000 miles on it. It passed the smog test last month so the engine isn't in too bad of shape for its age. Ignition is ok. However, it misses throughout the driving range. I tested the fuel pressure on the intake and it was normal. For the heck of it, I replaced the fuel pressure regulator a couple of days ago because the smog guy said that it was bad (two years ago) but that didn't fix it. If this helps. When I relieve the pressure in the system, it will run ok for about an hour then the problem starts getting progressively worse until I can't stand it anymore and go to troubleshoot it. Unfortunately, I have to relieve the pressure to look at anything and when I do, the car is normal and there's nothing to look for. It's a vicious cycle. I don't want to blindly go and replace the injector and/or the fuel pump unless I have more evidence to support that one of these could be the problem as I already was wrong on the pressure regulator. Have you seen or heard of this problem before? Any ideas? Thanks.