Use the scan tool to determine the fault
low fuel pressure sounds like a candidate for the problem followed by crank position sensor but the scan of the faults will get closer to the rpoblem
SOURCE: Car won't idle without revving when cold and dies when in drive
This Vehicle needs an Idle air control/Idle speed motor. Good Luck
SOURCE: 1993 Mazda Mx3 Revving high/Fluctuating during idle.
there is either a vacuum leak,or a valve on the throttle body called an iac that is bad. it is the idle air controller.alot of mazda have that problem
SOURCE: 1986 Nova: engine stops while standing and at low
Is the choke opening up all the way after it warms completly up ? and have you checked the fuel lines to the gas tank they might have got pinched in wreck.
Testimonial: "Coincidently, I found the chock breaker vacuum line was disconnected yesterday. Can't wait to put it all back together. Thanks. "
SOURCE: intermittent problem. Truck ran fine
Check for sticking idle air control valve and stuck open EGR valve. Both are common causes for very rough engine operation due to fuel-air ratio being too far off. Also check for large vacuum leak such as from rubber hoses connecting PCV valve to intake. Feel around for squishy or oily rubber which would indicate a leaking hole in the rubber hoses.
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