Tested compression
Checked spark with tester
Checked injectors with Noid light
Did balance test on fuel injectors
Checked ohms on fuel injectors
Checked tps for voltage, signal, ground.
Checked fuel pressure
Fuel pressure regulator
Checked vacuum leaks
Checked valves and adjusted valves
Changed plugs
Changed distributor cap
Changed air filter
Changed fuel filter
Checked map sensor for signal, voltage, ground
Checked IACV
Watched o2 sensors on live data while introducing a lean and rich condition and at idle.
so, what I did find was that my fuel pump was putting out ten psi. I changed that and no help. I looked at my injectors spray and number 1 and 2 cylinders seemed like less spray than 3 and 4. So, I replaced them all. After I replaced the injectors the car was doing the same thing when given throttle and at idle. So, I turned the car off and came back a little later and then it seemed like my problems disappeared when I restarted the vehicle. I went and drove the car and no misfire/stumble when given gas or at idle. Well, I came back from the drive and the problems started again. It seems like I can make them disappear if I turn the vehicle off and turn it back on.
I was going to look into the main relay because maybe it is being intermittent. Also, thought throttle position sensor because the problem seems to happen when given a quick burst. Thinking the throttle position can’t keep up. Already checked it though by manually actuating it and reading the numbers. It checked good.
Any help is appreciated!
Thanks,
Jonah
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Monday, December 17th, 2018 AT 4:26 PM