Hello, I'm new with a problem!!!...

[91firefly]

Hi,

Where is the problem...

A friend of Me have a '91 Firefly auto trans with a 3cyl, 1 liter engine, and CFI carbed...

The car start good And the engine have a smooth idle, and run great, EXCEPT when You go on reverse or drive and don't move, the engine shake like a frozen cat at -20`, and once You accelerate this dissapear, the car run like new, I checked the compression and all is okay (around 140-150psi), I checked here and here and not found any bad, The cap/rotor/plugs and wires are new...

It shake ONLY when the transmission is engaged on a rev or drive, again, when You accelerate thats okay...

Any input please, This will be very very appreciated...

Best regards,

Dom.

[geokid]

Don't know much about your firefly but you may wnat to check the vaccum lines going to the tranny or other parts of the tranny? Just a thought.