ok i have just built a brand new 383 for my 88 blazer. it is flat top kieth black pistons, 97 c1500 roller cam and lifters, stock heads, and tbi. when the motor is cold it idles up and down and if you ease on the gas it spitter and sputters. it will go it just has no power. after it warms up it idles fine and has a lot of low end torque, but when you get to about 2grand it starts doing the same thing. if you hit the gas hard it does not want to go at all. when we adjusted the valves the passenger side is getting good oil pressure but the drivers side is barely getting at all. I had a circle track racer that told me that the valves are out of adjustment. they seemed to be right on but i may be wrong i have been before. i stuck a timing light on it just a minute a go and it is set at 0. when gassed it jumps staight to 12 degrees. and when you let off it drops straight back it is not gradual at all. i have not timed a motor in 12 years until now so is this correct? I did have a miss hap when instaling the oil pressure switch on the back of the intake that was not good. the brass fitting broke into the blockl and we had to brake it out. soem brass pieces and filings got into the oil jacket. we pressured up the pump with a primer and blew out the hole before putting the sending unit back in. i did find some fine particals in the oil but nothing larger than a grain of sand. does any body have any ideas or suggestions on my problem? i would appreciate any help i can get. thanks in advance.