[KensRedZed]

Greetings,

It sounds like conductivity issues between the track connections. You should be able to hold the cars on the track with the rear wheels off the track. Then hold the throttle down and move the car accross the track. You'll hear the revs drop when you pass a bad track connection. You need to separate the tracks and clean the tabs that touch each other from piece to piece. Some people install power taps around/under the track. Yet others install copper tape over the rails to keep the voltage maxed throughout. You can't disassemble a track once it's taped up.

Cheers,
Ken