Intermittent misfire or shudder

[zzzzzap]

I have an 07 Tahoe 5.3 with 116,000 miles. It recently began to shudder under a load such as going up hill with slight acceleration. At first I thought it may be the transmission but it feels more like a lack of power or misfire. It's not setting any codes. I feel it in the steering wheel and in the seats. I've changed the plugs but the problem stayed. I ran a can of SeaFoam injector cleaner through it but that didn't help either. Can a failing coil pack produce this symptom?

[2007tahoe]

I have an 07 Tahoe 5.3 with 116,000 miles. It recently began to shudder under a load such as going up hill with slight acceleration. At first I thought it may be the transmission but it feel more like a lack of power or misfire. It's not setting any codes. I feel it in the steering wheel and in the seats. I've changed the plugs but the problem stayed. I ran a can of SeaFoam injector cleaner through it but that didn't help either. Can a failing coil pack produce this symptom?

Any newer car I have worked on always throws a cyl misfire cell when a cyl is not fireing properly. With that many miles and being a 4l60e trans I would deff get the trans checked out.