About 3 months ago I noticed my car having a harder time getting up steep inclines. Now the car will crank then shake and cut off. It has done the same thing when idling at a red light for an extended time twice. It hesitates the worst when I am going less than 30 mph and then accelerating, ie merging onto a street. Not as bad on hwy going 55mph+ still feels like driving in quicksand. check engine light has been on. codes said running too lean and random cylander misfire. I have used octane booster, fuel injection cleaner, replaced spark plugs and cleaned maf sensor. 2 mechanics have said "i don't know" what's wrong. HELP!!!!! 2001 toyota corolla 138,000 miles 4 cyl. automatic