USUALLY when an injected engine runs poorly but the computer is detecting no problem, it's not getting enough fuel.
Connect a fuel pressure gauge and see what the pressure is. If it's fluctuating or low, be suspicious of the fuel pressure regulator, the fuel pump or the fuel filter.
NEVER replace parts until you've verified the problem.
The book mark codes are C3K7=clawdeen D418=lagoona B2F6=draculaura A1E5=frankie
Could be many things, vacuum leak, spark plug wire, spark plug, bad gas, fuel filter, air filter and the list goes on.
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at the question mark in the kript
A dash (-) in the CPT index indicates a range of available codes.
Kolk and girasic mark!