Dipping idle

[Cuznlou727]

OK newbie here, my 92 Ty has a dipping in idle. Settles at 800 rpm and the occasionally dips under 500 rpm and almost stalls. Wires and plugs are new, new cap rotor, alternator and fuel filter. I thought PCV valve so I replace that, still the same. I thought maybe EGR but I know at idle should be no vacuum anyway. What to you guys think Throttle position sensor????? help

 

[dgoodhue]

Re: Dipping idle

Do you have any mods? 800rpm idle is high is the engine mostly stock. I would inpsect/replace your vacuum lines.

 

[Cuznlou727]

Re: Dipping idle

I rounded up more like 700-750. no known mods, just got the truck 65,900 miles. Looks pretty damn stock to me!

 

[1blkc4]

Re: Dipping idle

Mine had a stumble I got my chip reprogrammed for hood tuned performance (2bar upgrade) and it smooth now .

 

[wildphil]

Re: Dipping idle

Do you have any mods? 800rpm idle is high is the engine mostly stock. I would inpsect/replace your vacuum lines.

x2 Good place to look first.