When injectrors are bad you have a KNOCK. And generally smoke and a miss.
But then with 221 K miles you definitelly got 8 bad spark plugs and definitelly time for new injectors also even though only 6 are bad. So tell wife injectors will fix spark plugs in short order and save three dollars each.
2008 3500 stock QCLB dually Inferno red. Toys: Fuel injected Rampage
, Road Grader, 1586 tractor, 60K genset, Honda ATV, and more. Back in business with a Hitachi EX270LC excavator. The dirt slinging has begun with 50+ acres to clear.