Mooney pilot reported a pitot tube blockage resulted in unreliable airspeed indications. Pilot landed safely and maintenance technician cleared blockage.

Narrative

The plane had been parked for 3 days. Did preflight and looked down pitot tube and saw no debris. Upon takeoff the airspeed started to work then just stopped accelerating. Beyond a point of stopping the takeoff was continued. Upon reaching a safe altitude; it was isolated to the pitot system and had ground speed from GPS. Decision to continue to 1st fuel stop was made due to longer runway and maintenance capability. Landing at ZZZ was done by GPS ground speed and no flaps to ensure the flap speed was not exceeded. After successful landing I took a straw from the FBO and attempted to clean out pitot tube. Thinking that the blockage was clear; took to runway to do a high speed taxi. Being used to flying at 5;500'+ elevation the plane accelerated and flew quicker while looking at ASI. Being 30' off ground and 1/4 of way down runway; I pulled power announced aborted takeoff and settled back onto the runway; stopping with 500' to spare. The aircraft was then taken to the maintenance facility on the field where the mechanics cleared the blockage. After another high speed taxi down runway where less power was used the airspeed indicator functioned properly and was signed off for flight.