No problems so far. idle is quiet. No loss of performance. I bought this truck in 2017, it's a Silverado 5.3 4x4 Ext. I had CK Eng Month. Missing light Really bad Went back to dealer Spark plug #1 Literally exploded. I thought I was bolted on the truck, {it had 1 owner, low mileage so I bought it} only the dealer changed a spark plug so I figured it just needed an adjustment, I changed the spark plugs {4 spark plugs including #1 looked bad) ran a little better but still had a rough idle. Gas station changed No Changed . 1 year later the same CK Eng Light No 1 Plug thing came back in stock, all the plugs were changed, 2 plugs on either side looked like they were broken, they were consuming oil. Started pouring injector cleaner. I only use the Gumout Multi System Cleaner. Tried other products, waste of money, 2 tanks back to back ran even better, idle a bit rough. I bought a used Petron Plus. It used to work well in old trucks. I stopped using oil. Did a lot of research on these Engs. with fuel management have found that problems do not only occur with me. Found some products Reviews checked I bought a Diablo Sport fuel management module, plugged it in and waited a few minutes. No problem. Rough idle. GONE works like a scalded dog. Works and sounds like it should. If you want to keep your engine, buy it. don't believe me CK from Fuel Management Issues on You Tube. BF Ohio
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