Ive noticed over the past couple weeks my 98 c70 HPT coupe accellarates fine and idles fine. BUT every 10 min or so ill feel a little stumble from either the engine or trans when im doing about 60 mph. i havent really torn into it yet and investigated, i figured id ask around online before i took it to a mech.

 

When was the last tune up including cap,rotor,wires?
How many miles?

 

i just bought the car recently and the guy said everything was recently tuned up. could it be the trans?

 

Could be a clogged Vent system,Mass Flow sensor going bad, It could be many things. Sad to say but you will have to try to wait till a check engine light comes on to know where to look.

 

the check engine light comes on from time to time.. i figured it was just programed to do so after a certain amount of miles. thanks for the help.

 

so i plugged my dads obd II code reader into the car today.. and no codes came up. Isnt the computer system suppose to store old error codes?

 

It usually does store the codes.