Please help

[jeffster]

i just changed the lower intake manifold on my 98 grand prix v6 3.8 not supercharged, but im having acceleration problems, tonight ui was driving the car on the highway doing 90km started going up a hill, pedal to the floor and it was only driving at 80 km, and would not go any faster but once i get over the hill the accelerations slowely climbs up again, any ideas, please help

 

[jeffster]

and the car slowly accelerates like that once i get to a certain speed, even on flat land

 

[98GTPCALGARY]

Just a guess but did you cross sparkplug wires, or damage wires, My car did something similar, and it was bad wires....

 

[jeffster]

no i just put new wires on the car!