Mitsubishi Repair: 92 Eclipse cold start, power loss, vacuum lines, throttle response

Question
One morning a few weeks ago, I tried to start the engine in my car. The engine cranked over, however it did not start. I had the battery, the starter, and the alternator checked out. They all checked out good. I also replaced the fuel pump and fuel filter. I found out that the the plugs are getting good spark, when I pulled them, and I found out that they were dry after cranking it several minutes. I also checked the fuel injection rail and it had fuel pressure. I then proceeded to take my car to a shop and I had them scope it. They told me that the injectors were not getting the proper ground to operation correctly. I checked all the vacuum lines, grounding cables, etc. under the hood and under the dash and I couldn't find anything wrong. After cranking it off and on for 10-15 minutes, it will start and drive, but it has lack of throttle response in power. Also the check engine light comes on after a few minutes of idling. Finally after a week of troubleshooting, the problem fixed itself and worked fine for approximately 3 days, but after those days the problem returned.

Answer
Quinn: First off you need to go to a parts store and buy yourself a "repair manual" for your car. They cost around $20.00 and are well worth the money. I wonder if you don't have a sensor someplace not working just right, I mean the car fixed it's self but three days later it is doing it again. Sometimes something like rain and so water getting into something will fix things but till the water drys up. Or the road you drove on or where you parked your car. I mean sometimes you find yourself not believing that, that could cause your car to fix it's self. It takes three very important things for that car to zip down the road, fuel, air and stark. But then got to have a good computer to mix all that together in but a few seconds of time. The computer gets it's reading from sensors all over your engine. If a sensor is weak or even out, the computer does not know this and will try to run the car from how things should be. Of course with that sensor not working right, that part of your engine does not get the reading it should have. I am thinking maybe your oxygen sensor is getting weak or has a lot of oil on it. So that the reading are not right from it. There is also a throttle position sensor(with this reading the computer can determine fuel delivery. A broke or loose TPS can cause intermittent bursts of fuel from the injector and an unstable idle because the computer thinks that the TPS is moving. But with your manual you could learn how to use a voltmeter and check your car's sensors. You could check make sure your new fuel pump is putting out enough fuel. Sometimes those new fuel pumps are not good. I mean I have had to put more than one in, a few times because for some reason the new fuel pump did not work right. So this is just things to try and just thought from my repair manuals. Hope this helps you and good luck!