so my 1992 5.7 suburban's egr valve is opening and closing every 5-10 seconds

Asked by Oct 09, 2016 at 07:01 PM about the 1992 GMC Suburban

Question type: Maintenance & Repair

So I have replaced o2 and cleared code, no new codes, EGR valve is opening
and closing every 5-10 seconds cold or hot causing engine to surge at idle
runs fine at speed, any ideas ? I have not replaced the EGR controller yet, but
I have cleaned both EGR and IAC. I can see the EGR cycling and it is the
cause of the surge if I unhook vacuum line it stops of course.

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