Posted: Mar 19 2011 at 3:12pm | IP Logged

I had the frontier loaded up earlier today with about 1500lbs of patio tiles and sand and when I was driving home I noticed the truck was jolting a lot .

I was doing 55mph and the engine was running about 1800rpm. I turned on the overdrive and the rpm went up to 2250 rpm but I noticed the jolting still but not as bad. I went back for another load and when the truck is empty it drives fine (so far). It really is bad when you have the cruise control on too??

Now I run the truck on 87 octane since gas prices hit the roof, so I am wondering if its holding itself back with the anti-knock or is it transmission related with coolant leaking into the transmission. When I came home and let it cool down I checked the engine coolant level and all seemed ok and with no sign of contamination in the reservoir. Any ideas

My truck is a 2008 V6 SE with the VQ 4 litre Auto