accelaration drops after speed 50 mph

dear colleages
my car is od euroean car "lada"
its accelaration drops after speed 50 mph
pls help

uuuuh its a lada?

uuuuh its a lada?

that is really help
thanks dude

lade engine is very very harsh one
it last 13 years of hard work with full power and no minimuim rebuilding

personnal experience

im sorry but you offer almost no information that i can make any sort of accurate diagnosis. first thing i would do is check fuel pressure, compression, and possibly do a tune up if its due for one.