1999 Chevy Blazer


I have 1999 chevy 4 wheel drive blazer that does not like to start after sitting for more than 12 hours. 240000 miles. I have had the fuel regulator replaced twice and most recently the starter. The symptoms: I turn the key and the car begins to sputter, cough and shake and it contiues shortly after I release the key. I managed to avoid having it towed back to my mechanic twice by once flooding the engine - after about 15 minutes of vigorously pumping the gas pedal through the shakes it started. This last time my husband shook the car while it was convulsing and it started almost immediately. We (including our mechanic) are stumped. Any ideas? Thanks Rose