[gmello]

hello thanks in advance

2000 deville standard

88k miles


i got a code of p0420 catalyst efficeincy below threshold bank 1

p0601 int contrl module memory check sum error




the service engine light comes on and the car acts funny
like trans is slipping when i press the acclerator

then about 1 hour later the light goes out and stays out for weeks and then comes back on

when service engine light is out the car runs fine


and also some times when i start my car it starts then cuts off like a hard start


and some times it when i start it up it givee a ticking sound real quick and then it catches to start the car

thanks

is 88k time for a tune up