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Originally Posted by dtrain
it will still struggle to turn over but it won't require as much gas from the accelerator to turn over and smooth out the idle.
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Depressing the accelerator pedal does not provide more gas. It provides more air.
If you remove the OVP and it rattles when you shake it(be sure flap is held closed), you need to replace it. There are other ways to test an OVP, but the "shake" test can be useful, especially if you hear rattling.
The fuel pressure reg. is tested with a fuel pressure gauge suitable for CIS injection systems. I'm fairly sure your system is CIS.
Engine coolant temp sensor is tested by measuring resistance.
I'd suspect that maybe your base mixture is off and that's why you're getting some relief by depressing the accelerator pedal.
If you don't understand all of these systems and how to use the equip. required to test, you'll need to pay a tech an hr. or 2 in labor to diag.
You may get this fixed easier/sooner/etc. doing that.