Intermittent idle issue. (1 Viewer)

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Update: cleaned electrical connector to tps. Drove about 100 miles then problem came back. Replaced tps with new oem and adjusted per fsm. Still have idle/stalling problem.
 
Something I noticed today as I was messing with it for the thousandth time. When I have the 2000 rpm rev and let off stumbling/stall. (Rpm’s drop below 4-500 and dies or almost dies) If I disconnect one of the vac lines on the Egr modulator it will not stall.
 
Any thoughts on the egr modulator finding above? Hoping for some more ideas before I admit defeat and take it to the shop. Thanks
 

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