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Showing results for tags 'rough running'.
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Just got the 2014 Silverado 5.3l 4x4 back from the dealership from having the entire top end of the engine replaced ($9000+) at 106,000 miles. Noticed oil on the plugs & immediately started smoking. But NOW - 5 days later, the truck shudders at 35-50 mph, especially if going uphill at a low speed. Does anyone have any suggestions for what this is due to or how to correct it - preferably without spending another $5-10k. This was a great truck up to 100k miles, but now it seems to be falling apart. Put a Hypertech programmer on it in late 2017/early 2018 to turn off the afv, (at about 70k miles & that's all I used it for), hoping to avoid the problems that causes, but no luck. Now this transmission thing is happening. It used to shift hard at low speed & when cold, but this shuddering is new.
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- rough running
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1996 5.7l truck code p1345 runs rough when warmed up
rhensonsr posted a question in Ask the GM Technician
3 weeks ago, I bought a 1996 ext cab Chevy that runs like a dream when the engine is cold, but runs increasingly rough as the temp increases. P1345 comes on as soon as it is started. Today, I drove about 10 miles until it died. Since it would not start, I thought it was the timing chain but when the wrecker driver arrived (1 hr later), it started up and ran like a dream. Here's a list of what I have replaced: cam sensor, crank sensor, fuel filter, plugs, wires, cap, and air filter. No coolant loss noticed yet. Any help is appreciated.