Misfire seems like the engine is choking when going under load.
Changed EGR.
What is your question?
Misfire under load feels like the engine is choking.
Replaced. Spider egr cat distrib wires plugs
Runs great until hills or heavy acceleration for more than ten seconds.
What makes this problem better or worse?
New egr valve. But not 100%
How long has your 1999 Chevrolet C1500 Suburban had this problem?
RepairPal Certified shops can diagnose and repair your 1999 Chevrolet C1500 Suburban. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Replaced distributor - research > crankshaft position variation re-learn procedure.