i was on the freeway the other day doing about 3500rpm, when i exited i noticed that the engine had a rough idle, ticking noise, and the exhaust sounded strange. i took off the rocker cover, started the engine and saw that one of the rockers next to the fuel pump was hardly moving, i adjusted it a little and the idle got a little better but its still not moving much compared to the others. i think its time to buy a new cam and lifters.