Ok so first post, I have a 2007 RRSSC just done 81k KM. Purchased 8 months ago on 66k KM. Was using 95unleaded but was advised to only use 98. Done 3 tanks of 98 and now having start issues. On first turn of key engine tries to start, sounds like it runs on 1 cylinder for a few secs then tries to auto start again but does not even fire. Have to turn ignition off wait a few secs then try again. Usually on second attempt it does same 1 cylinder start but then slowly picks up and runs normally. Stinks of fuel for a few secs. Runs fine after this and starts fine once warmed up. Leave it to go cold and same issue happens. Any ideas?