Eagle Summit Acceleration problems by year

Vehicle had finished warming up, with foot on brake and putting vehicle in reverse, it started jumping backwards and stalled. Consumer put vehicle in park, retarted it, and it took off. After a mile, vehicle started losing power. Mechanic and consumer were going for a test ride, and vehicle woldn't go into any gears.*Ak

When driving the engine will high idle position, open throttle position, to stop vehicle put into nuetral or apply the brakes. Consumer states while pulling into traffic, vehicle would not move the engine was racing the transmission grabbed jerking the vehicle foward squealing the rear tires, consumer states this was not the firt time this has happened.*Jb