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H2, year- 1. Full tune up However, run like it is missing.

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H2, year- 1. Full tune up However...
H2, year-
1. Full tune up
However, run like it is missing.Diagnostic code: p0300.
How can I resolved this.
Submitted: 9 months ago.Category: Car
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Answered in 2 minutes by:
8/6/2017
Auto Mechanic: Gary, Technician replied 9 months ago
Gary
Gary, Technician
Category: Car
Satisfied Customers: 17,914
Experience: GM master tech for 15 years/ASE master tech for 20 years
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Welcome! My name is ***** ***** I will do my best to assist you with this problem.

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Auto Mechanic: Gary, Technician replied 9 months ago

is it missing at idle or only when driving at speed ?

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Customer reply replied 9 months ago
both:
Auto Mechanic: Gary, Technician replied 9 months ago

at idle with it missing if you unplug one ignition coil at a time will any you unplug NOT make a difference in the idle ?

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Auto Mechanic: Gary, Technician replied 9 months ago

we need to see if we just have 1 or 2 dead cylinders

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Customer reply replied 9 months ago
Ok, Gary.
I will chat in a few. going to unplug ignition coils one at a time and observe.
Auto Mechanic: Gary, Technician replied 9 months ago

ok

let me know

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