SLOW THROTTLE RESPONSE 2012 John Deere 310J Backhoe Loader / 2wd

When you turn up the throttle control on the right hand instrument panel -OR- When you press the foot throttle all the way to the floor, It takes SEVERAL seconds before the engine gets to full RPM. A real disaster when trying to use it as a loader. Once it finally reaches full rpm it maintains full power under a load / very strong.

All new filters, not sucking air, and NO ERROR CODES!

Anybody experienced a mystery like this before? (I liked em better when they had a direct linkage from throttle pedal to injection pump - never had any problem like this for last 20 years!)

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SLOW THROTTLE RESPONSE 2012 John Deere 310J Backhoe Loader / 2wd