More than likely with it being an lb7 it'll be bad injectors. What happens the bad injectors let fuel through when they shouldn't and it's able to build enough rail pressure while cranking. When you spray it it cranks fast enough to fire. Once it's running it's turns fast enough to maintain rail pressure. Get your balance rates checked.
cc/sb lb7, lowered, cut & delipped, lbz rods, keyed, balanced, ati, so cal flex, studded, +40 nozzles, going 360/480 from SDP
Last edited by Meshanic; 12-12-2012 at 08:31 PM.