engine on 1998 Nissan Frontier

v6 engine runs perfect for 30 miles then starts ,run eractic or pulsating ,like turning switch on and off. has 135,999 miles

by in Paris, TX on April 05, 2011
1 answer
ANSWER by , April 05, 2011
could be fuel pressure or spark. you need a shop to look around in the computer for freeze frame data to see what has failed. Roy