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Check engine light has reported that the cpu has found sensoes out of parametyers during the checks. Check fault codes for oxygen sensor, idle speed sensor and air flow sensor.
The BST engine in your Caddy is prone to a couple of design flaws that can cause the trouble you are experiencing. Certainly, it could be an injector but could also be down to timing or the camshaft sensor. If you haven't had the timing belt changed, it may have stretched a tiny bit and that's enough to cause the problems you have with lumpy idle. Timing is adjusted on the camshaft pulley - but tiny adjustments can make a big difference. The EGR valves are also prone to sticking causing black smoke. Hope that helps a bit.
You've done a lot of work. How does your EGR valve look Its the 'space ship' gizmo under the air cleaner. Remove and decoke is a quick job and it may just cure the lot
Ouch! you've got engine coolant in the exhaust from a leak somewhere...DO NOT run this engine until you get someone (dealer is best in this instance) to diagnose ($50-125)
the starting problem could be head gasket if it got really hot..... black smoke wouldn't be oil, and gas would stink but not black smoke if it's old, it wouldn't really matter if it had been sitting for 4 months. black smoke is probably caused by a gas mixture problem, or maybe a stuck fuel injector.
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