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1. compression test
2. boost leak test (yes i Know you do not have a turbo do it anyways)
3. disconnect / change O2 sensor
4. basic tune-up: air filter, plugs, wires, rotor, cap, fuel filter
5. If problem persist after 1-4, begin diagnosis by changing the following OEM parts, from easiest/cheapest to more difficult/most expensive:
A: ecu
B: maf
C: coolant sensor
D: wiring harnesses
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