P1404 Pontiac -

Question

Hello-
Replaced MAF on9/13; engine cleaned 9/13; started having pulsing issues after MAF and engine being cleaned; car would "pulse when at 45-50 mph or going up slight inclines; no issue could be found=system showed no misfires; recently check engine came on=P1404; replaced EGR; same issue is happening (pulsing); what else should I be looking at?

Answer 1

Did you clean the egr piping?

here is the diagnostic procedures for this problem