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EGR codes p1404 & p0404
P1404 egr stuck closed and P0404 exhaust gas recirculation control circuit range/performance.
This is on a 99 Suburban SB350 that belongs to my neighbor.
Not sure what to replace to fix this anyone done this before? Napa says there’s an EGR control solenoid ($30) and a EGR for $179. Not sure how to test these. Is there a simple test to determine what need to be replaced?
s/t
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. 
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