2004 Isuzu Axiom Cylinder 2 Misfire

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I have a 2004 Isuzue Axion with 149K miles on it. A few weeks back I started experiencing engine sputtering, loss of power, with the check engine light coming on. The local shop replaced the wires, new OEM spark plugs, etc, so essentially a tune-up. The light did not come o any more. A week later, the light comes on again, with the P0302, cylinder #2 misfiring. The Axiom has all the classic symptoms of sputtering and loss of power when driving. The shop replaced the coil packs, all the obvious stuff, but no luck in fixing the problem. I took it to another shop, and they initially estimated an $800 to $900 repair bill. The shop then called me back, saying that some bolts had gotten loose in the engine causing major damage. To reattach the plates, the estimate was $400. To repair the engine, with no guarantee of the work, was $2500. I authorized the $400 repair. The Axion still sputters. Here is what was listed on the service order: CUSTOMER STATES "CHECK ENGINE LIGHT" LIGHT, ROUGH, MISFIRE PHONE OK FOR DIAGNOSTICS INCLUDING TEARDOWN COMPUTER MANAGEMENT SYSTEMS ANALYSIS,WITH ENGINE PERFORMANCE TESTS, P0302 COMPRESSION & CYLINDER LEAKAGE TESTS R & I THE UPPER INTAKE MANIFOLD I FOUND THE AIR PLATES AND THE PLENUM LOOSE *& SEVERAL BOLTS WERE INJESTED INTO THE ENGINE. REPAIR/TIGHTEN THE LOOSE AIR INTAKE PLATES IN THE PLENUM ENGINE VALVE DAMAGE IN THE #2 CYLINDER