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I have a 2003 Trailblazer LT w 4.2l six. Dealer I bought…

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I have a 2003...

I have a 2003 Trailblazer LT w 4.2l six. Dealer I bought from had replaced fuel tank and pump assembly. Now it's developed an intermittent miss at idle and while driving. Computer code shows a miss fire, but no specific cylinder. Mechanic friend suggests replacing ignition coil and / or the throttle position sensor. I also noticed that sometime the cruise control will work, sometimes it doesn't engage. The car has 112,800 ***** ***** on it. Any idea?

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

It's annoying at idle, but worrisome that while driving 55 @ 1600 rpm there will be a miss (or hiccup as I'd like to say) and notice the tach jumps about 100 rams. that should be rpms

Submitted: 2 years ago.Category: Chevy
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Answered in 1 minute by:
2/19/2016
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 17,913
Experience: 15 years GM master tech
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did you replace anything yet ?

are there any codes set at all in the computer ?

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Customer reply replied 2 years ago
Nothing replaced yet. Codes just indicate misfire, no specific cylinder. Just now the Service Engine Soon lite came on. Any thoughts? I'm not confident on driving this here in rural PA (don't want to get stuck).
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

any access to a scan tool to view live computer data ?

we need to know if it is a specific cylinder or if all are showing a misfire to know which direction to go next

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Customer reply replied 2 years ago
My friend checked it this morning. No code showing as to which cylinder, just 'miss fire' occurred. He suggested buying one coil and try replacing #1 cyl first, then go to 2 and so on to see if it settles down to smooth idle.
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

that will be very time consuming you need to plug in a high end scan tool and see which cylinder is misfiring on the current and history misfires in the data list

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Customer reply replied 2 years ago
He used a big Snap-on hand held box this morning... It only showed a generic misfire code.... Again, no specific cylinder was showing. I'll pass by his shop again in about an hour.
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

ok you need to view the live data list and view the current and history misfires on the data list

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