Nissan Almera Auto 1.8 SE 04 - Nissan Auto Blues - John the baptist

Hi i was looking for some help with my nissan almera automatic, 1.8 se 2004, it has just passed its MOT and has been serviced by main nissan dealer, last service at 46,000 it now has 51k on the clock. I was driving y'day on a dual carriageway and when i tried to put my foot down i felt a lack of power and the car was very sluggish, upon my return i noticed that the car felt overheated although the heatometer was normal, it also smelt like somethign was burning, i am at a loss now as it appears that the car in the lower gears takes along time to engage gears, this is not a regular occurence, this is irregular, i was thinking maybe i have cluth burning or maybe the air mass flow meter, but there is no sign of an engine management light, is it possible that i could just be the gearbox oil, i have checked all other fluids....please help before i get ripped off and spend more than the car is worth....

Nissan Almera Auto 1.8 SE 04 - Nissan Auto Blues - Cris_on_the_gas

might be a sticking brake caliper, does the burning smell come from the wheels ?