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I have a chevy Silverado 2500, 2001, 6.0 motor, we have put…

Customer Question
I have a chevy...

I have a chevy Silverado 2500, 2001, 6.0 motor, we have put a new fuel pump, fuel filter, all new coil packs, all new spark plugs, all new injectors, and it still throwing a PO300 random misfire code.

Mechanic's Assistant: Have you seen the misfire code before? Has the car been stalling?

Car does not stall. This is the first I've seen this code. It doesn't stall but has a slight miss to it.

Mechanic's Assistant: Are you fixing your Silverado yourself? What have you tried so far?

Yes, I'm fixing it myself because I've had it to 2 different mechanic shops and it's still acting this way. See my first reply for what I've done so far.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

We have removed the catalytic converter, installed new muffler, all 4 O/2 sensors are still in place

Submitted: 8 months ago.Category: Chevy
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Answered in 1 minute by:
11/20/2017
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 8 months ago
AMEDEE
AMEDEE, CHEVY TECHNICIAN
Category: Chevy
Satisfied Customers: 28,146
Experience: ASE certified tech ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector
Verified

Hello and welcome!

Thank you for your question. My name isCustomerand I will be happy to assist you today. I am reviewing the details now.

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Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 8 months ago

Can you feel the engine run rough? If so, does it run rough at idle or under a load?

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Customer reply replied 8 months ago
It runs rough both at idle and under load
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 8 months ago

Got it! Thank you for that information.

What is the engine vacuum at when the engine is at idle?

Would you be willing to speak on the phone?

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Customer reply replied 8 months ago
I will check the vacuum and call you later this morning if that is ok
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 8 months ago

YES, that sounds good

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