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I just bought a second-hand GMC 2003 Savana. Drove it home, ran beautifully. Was very pleased. Got in it the next day to try to go to work, engine would not start. Cranks fine, lights, radio, A/C but engine only coughs a couple of times as I let the key go. I wait an hour, turn the key, starts up fine - as if nothing was wrong an hour before. Next day, it does the same thing - won't start. Crank sensor, fuel pump?
Engine idles fine. When driving along, if I have to brake sharply or 50% of the time when I come to a complete stop at a junction, engine will cut out. Always starts straight up and will idle indefinitely, but again, driving along, at the next complete stop, it cuts out. Have changed plugs, leads, distributor cap, in and out of the mechanics a million times and they don't know what the problem is. Now they are suggesting timing chain, or a bad valve. Any ideas anyone?