i have just purchased a 52 plate nissan primera se the car has been clocked by about 40,000miles the problem is that when i use the indicators the car seems to lose power even though i have my foot down all the way on the accelerator, the car has been in for two diagnostics and come back with no problems found can you please help.

Optional Information:
2002 Nissan primera se 1800

Already Tried:
diagnostic testing