Frankie Muniz had a real scare when the star was involved in a nasty crash during a NASCAR Craftsman Truck Series Championship Race … and was seen limping into an ambulance.
The race happened Friday in Phoenix ... obviously ending for the star-turned-driver who was involved in a multi-truck pile-up on the raceway.
Right after the wreck ... Frankie sure did look like he was hurting ... captured on video limping and hunched over, but walking under his own power.
Thankfully .