First post here but i just picked up an 05 GC with the 5.7 in it. I've noticed a slight hesitation or shudder when going up a slight incline at around 50-60km/h. It has 160k on it and it also is hard to start. It will start up fine if i turn on ignition for a few seconds before cranking it over. What should i be looking for to help solve this issue?