my 08 ran good for 10k miles then started to stumble. had sert and true duels install 2k miles. runs good when cold most of the time dose it a lot after 50 to 75 miles on hwy then when i get in town it will start. on hwy once and a while after gear change.also after it sits while in store for gas or short brake been back to shop had new crank sensor and dino #2 now stumbles about same computer show no codes dino 2 shows 1hp less 2 fpt more than one. read a lot about ve's or is it vt's charts don't have actess or know how to this stuff how about any suggestion.