Have 87 Z28 5.7 auto. I have a problem where the car seems to hesitate around 25-30mph. Dies off sometimes at stoplight. Seems to run alittle better with the air conditioner on. I think it effects the charging system it some way. Could this be the distributor, ignition, or something else. I noticed my timing does not stay set, it is always changing. I have had a tuneup done on the car, changed the fuel filter, flushed transmission, fuel injectors were cleaned and flushed. Any ideas?
Thanks in advance!