Hi all, my 91 is giving me a challenge. I can not start the vehicle. The motor (350, TBI) is turning over but it just will not start. This is what I have done thus far. - replaced starter and solenoid - checked for gas and both injectors are working fine, getting plenty gas in the TBI - checked for spark by pulling the #3 wire and grounded to the block, this was okay. What else should I be looking out for? Thanks in advance.