hi there people

sorry for the bad english but i,m from Holland

i,m having some problems with my 1984 firebird 5.0 V8
lately whem i,m driving and i turn on the a/c or heater
i feel powerloss the engine lacking a bit of power
esspecially when i mover the lever to choose position of the vents

but when i leavethe lever in one position i feel like every five seconds the engine loses power and the 5 seconds nothing then 5 sec. powerloss again

in the a/c mode i feel more powerloss then when the heater is on
does annyone here know what i should look at?
i,m thinking or hoping a vacuum leak

please let me know what you think
thanks in advance

Oakleyz

 

I am having similar problems. Search this site for vacuum leaks and there is some really good info.