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Your photo is clear as mud but in the location above / behnd the crank pulley you have the water pump with the radiator and heater hose connections; ALL are potential major source of leaks when old and worn

If he still has the original tires then they are probably rock hard by now and not helping his ride problem He may find a substantial improvement by fitting a more modern tire with more compliance

:thumb 84 was the hardest riding, best handling C4 made. The base suspension from 84 was the "performance handling" suspension option in later years Not alot you can do short of installing the softer suspension from a later year

Codes 51,52, 55 Is there anything on the memcals (chip ) to identify that they are correct for your car

Breaking up under load is more usually a spark /Ign problem How good are your plug wires?

Maybe the outer ring with the timing mark has moved from the correct position; not uncommon for the rubber to break down with age allowing the outer ring to move. Only way to verify that TDC indicated on the balancer is actually true TDC is with a piston stop in the spark plug hole

If you have only one on the side cover where the selectors are ,as shown below it narrows the trans down to '85, '87 or '88

How many switches on the side cover ? (not including the reverse switch on the case )

:thumb See http://www.corvette-guru.com/uploads/smartsection/3_CCMCodePull.pdf Pay attention to which module you are reading the codes in Also read Lt1 No Start Diagnostic - Automotive - Forum

EGR temperature switch When the computer commands the EGR to operate ,the hot exhaust gases flow pass the switch to the EGR valve and it tells the computer that the EGR is working correctly. If the switch or wiring to it is faulty, the computer will put up a code 32 to show a EGR fault even...

On a MAP TPI TB the Op has installed The top port ( # 7 ) is the CCV air supply to the pass side rocker cover The one underneath ( # 8 ) is the CCP vac port from the purge canister There is a small ported vac outlet underneath the TB that operates the EGR solenoid The MAF, fuel reg and AIR...

You did mention the front throttle body which would make one assume you have 2 TB's ;ie a stock 84 CFI engine At idle ? That port is ported vac only Your MAP sensor is connected wrong , it should be connected to one of the 2 vac ports at rear of plenum with as short a line as possible for...

Does the fuel pump run when the key 1st turned on? What fuel pressure do you have at the rail when it primes? Does the pressure hold up? ( how long ?)

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When it won't close does the motor do anything ? Make a noise , try to run , click , bang ...................? Do you have power at the motor on down circuit when trying to close? Have you checked the 3 relays that operate the motor ?

Your car is old , everything is prone to failure from old age, nothing in particular. Would be advised to do a basic health check and tune up to identify any suspect areas as you would with any car The fuel system has a oil pressure switch as a backup should the the pump relay goes out. You...

Check the light switch in the drv side door jam

Further investigation needed. If the cable is worn and not moving correctly it has no adjustment. Either replace or disconnect and secure it in the unlocked position The trans lockout cable is the black one on the drv side of the shifter

Being used and moved for 20 years Nothing lasts forever