1993 ford explorer xlt starting/idling problems

[slf]

I have a 93 explorer, sometimes it starts fine and idles fines when it does idle fine I can shift from park to drive and lower gears with no problem but when i put it in reverse it dies on me every time unless i give it some gas then other times it won't start at all and other times when it does start it has a ruff idle. i can hear the fuel pump engage when i turn the key, i don't know what the fuel pressure is but when i depress the valve on the intake to see if i have fuel pressure it sprays pretty good so i don't think its a fuel problem it did throw a code that said i had a low voltage on fuel relay switch i checked my alt. its fine and battery connections and grounds all fine and no vacuum leaks anyone got any ideas for me to check

 

[trashtruck]

might be time to clean iac valve or maf sensor. both can do strange things to idle.

 

[gmbroy]

Id listen to trash-truck , plus I would clean the throttle body good . all these things can affect your idle & are cheap things to do .Let us know if it helps .