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Hello John, Eddie here and I will do all I can to help. First thing I would check is this, with a spark tester, and while it's running bad, take off one plug wire at a time and make sure you have spark to each individual spark plug. If you do NOT have spark to one of the plugs, then it could be the ECM, or an ignition coil pack, but if you have spark to every plug, then it may be an injector or compression is low, have you verified whether you have spark to each plug yet when it's running bad? Let me know. Thanks.
Alright, have you checked compression by chance? If all cylinders have spark, then I would check compression next, if those are all 130 lbs are better, then I would ohm out all the injectors next. Check the injectors across the pins and see what they read, I believe those are supposed to read around 18ohms. See if they all read the same. if one is significantly different than another one, that would likely be the culprit. Check fuel pressure as well.
Also, take a spray bottle, with some soapy water, spray the coil pack and look for spark, lot of times they will run OK dry, but when they get damp, you'll see spark shoot out the side of it.
or baking soda, makes the water conduct a little better.