-turns over but won't start -changed fuel filter and fuel pressure regulator -chaged spark plugs -there is some spark but it's not constant, Is this normal? -any ideas?
Check your battery as it supplies juice for the coil. Then check your coil or coilpak and the crankshaft sensor. The bad spark may be an underlying reason for how the truck has been running.
Do you know if the fuelpump is working? The Inertia sensor may have tripped while you changed regulators. You may need to reset the button on it to connect the fuelpump.
Check down where the timing pointer used to be for the crankshaft sensor. Since this is an older engine than a 1992 you may still have the grey module that plugs into the distributor. This module was the type that used a conductive cream to use when you mount the module to the distributor.
If you have that type of module you also had a plug connector above the water pump going to the distributor. That type of system set base idle with the connector unplugged and still had a timing mark. The crankshaft sensor may be on the drivers side of the crank since the timing plate is still used on the passengers side of the crank.
Modules were notorious for going out without warning. There is a special tool shaped like a short screwdriver for removing the mounting bolts without taking out the distributor. You can just pull the distributor if you want. Since you know the electric spark is inconsistent the module would be a good part to replace.
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Battery and coil are good. fuel pump is working. inertia switch is good.
where would i find the crankshaft sensor? motor is an 1988 351
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