I have a 94 Ranger 3.0L with 168K miles. It runs great, but has an issue on cold startups, When I crank it up, it goes to high idle (normal) and it drops back down to the normal idle. When it reaches normal idle speed, after about 30 seconds of running or so, it suddenly will bog out like it is straining to run. The RPM will drop a little bit, then, after a few minutes, it will idle back up to normal. After the engine fully warms up, it runs great, shut off and starts right back up, no problems. No driveability issues either. I have checked all vacuum line and did a found no problems. I have also put my vacuum gauge on it and it is rock steady at about 17 inches. My CEL is on, and when I do a code check, it comes up with a Code 327 (EGR feedback signal is/was low). I am not sure what to do with that one. Is that a bad PFE sensor or maybe bad EGR valve? Could that cause this whole issue?

I will try to get a video of the issue up on Youtube today.

Thanks all!