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? DPFE &Vacum regulator solenoid

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Have some issue with idle. So today I am look around the motor wires hoses and anything out of place. I remember reading while back about issues with the EGR pressure sensor and the Vacum regulator solenoid. On my 2002 they are on top of each other. My question is if I unplug them shouldn't there be change in the motor when it is running?
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If they are presently causing trouble yes. Unhook and plug the vacuum hose to EGR valve only. That weeds out the entire system unless the valve itself is stuck partially open to leak.
 

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Not what you were told to do, if solenoid stuck and not venting then EGR could still be stuck open and your test worthless.
 

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Then not EGR UNLESS it's possibly stuck at valve itself and not that common on these. But possible.

Most (not pointed at you of course) haven't figured out yet the two major idle problem differences. One, just won't idle or does for a second or minute then dies-but idles correctly and EVENLY if throttle manually brought up a bit, and two, ERRATIC idle or misfiring doing it, engine shaking around. Two different directions there. The work and money spent can often be halved by determining which one and only the OP can do that. But no one ever spends two seconds thinking about that (sigh).................

Even idle............IAC, TPS, TB bore clogged with deposit

Uneven idle.........vac leak, ignition quality, pcv leak, unmetered air

MAF probably goes in the uneven column but could be either I'd bet.

Vac leak can mess with your mind, small enough to where it still has idle trim fuel left and the idle goes too high, then as it runs out of trim fuel drops back and then begins to misfire.
 
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