Yes. Haven't been able to figure it out.
Have always filled with 91 octane of course.
anyone having issues on cold morning starts where the car is shaking/trembling at warmup idle?
obviously this problem isnt as prominent at this time of year...
Yes, have been having this problem along with intermittent loss of power under acceleration, worst in colder weather. It has not generated a CEL in spite of what feels like a random misfire that shakes the car.
I have been using nothing but Chevron 94 Octane Premium Plus since the vehicle was purchased in May '10 (just over 29,000 km) , and the randomness of the intermittent misfire and power loss issues make me think it is not fuel quality related.
I use 91 always and mainly Shell.
Cold start tremble.
Cold driving thunk from transmission shifting, mainly downshifts.
Cold driving hiccup when driving, rare but happens.