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The timing belt has been installed per factory directions.
Engine Vacuum at idle 18 psi, as the motor revs up it makes a momentary drop to 15 psi than at 2500 rpm it is 20 psi. This all seems within normal limits to me. I have also checked the fuel pressure, tested injector resistance, tested injector spray pattern and flow rate, all are within normal limits. The spark plugs have been replaced with factory recommended Denso Platnium plugs. Fuel filter, PCV valve, air filter have all been replaced. This is a Coil On Plug system and all coils have been tested and found to be within factory limits. System voltages and grounds have been checked for both voltage and amperage draw, all within limits. All four O2 sensor have also been replaced (not because of this problem).
As you can see I have tried a few things. The problem is this vehicle didn't have this problem before the timing belt and tune-up. A note: we also replaced the clutch at the same time.
This information bulletin outlines the proper steps to index the camshafts with the crankshaft. In the event that camshaft timing has been disrupted, due to timing belt breakage or camshafts/crankshaft being rotated without a timing belt, this is important prior to timing belt installation. Due to the gear-ratio used by each camshaft pulley to drive the camshafts, engine timing cannot be indexed conventionally.
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Double-check the timing belt installation using the bulletin 00-S005.If the timing belt is installed correctly, check for a plugged catalytic converter on that bank.