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code 1404 is exhaust gas recirculation system valve 2 need to test ur egr valve and tube --check receiving proper vacuum[check vacuum lines for leaks] remove and check valve 4 proper movement as well as clean off carbon buildup[usually the problem carbon causing valve to stick]
. The EGR valve is located in front of the oil filler neck. All you
need to do is remove the electrical wire from the top of the valve,
there is a clip on the connector so don't try and pull it off without
lifting the clip. Once the wire has been disconnected, just unbolt the
two bolts holding the EGR valve on. Thats it.
Is the check engine light on? If it is, take the truck to an autoparts store and have them use a scan tool to retrieve the fault code(s) stored in the computer. I would suspect a faulty throttle position sensor or bad EGR valve, but the code(s) should narrow the problem down. Sure hope this helped.
Replace the fuel filter and clean the MAF sensor with MAF cleaner. Just fallow the instrction to the MAF cleaner. The other thing to is the 1995 4.3 is know to have the EGR valve getting sluggish due to carbon build up. Remove the EGR valve and use Carb cleaner on it to remove the EGR valve and make sure it moves freely. Good luck and hope this helps.
If it is not just badly clogged, the intake does not need to be cleaned out. If you want to clean it out then take some brake cleaner and spray it in there and wipe it with a rag. I have never seen someone have to clean the intake due to not being clogged. Just my expierence I would just change the EGR and go from there