Its a 1999 silverado new model, v8, half ton 85,000 miles, I changed the spark plugs with expensive irradon type, also I changed the fuel filter,and pump in the tank about 15,000 miles ago. after warmed up it starts ok after stopping for coffee. but let it stand and it takes 3-4 tries to start, then starts like it barely wants to start, then turns on ok.
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Your truck has what is called coil in plug commonly known as CIPS. They are located on top of the spark plug boot. You have to take out small bolt that holds it onto the sparkplug. Then you can take out spark plugs. The CIPS are expensive (about 85-100 per cip). I ordered mine on the internet for about 10 bucks a piece and the were new. Be advised you may not need to replace all the CIPS. I only had to change 3 out of 8. Have autozone run a code check then you will know exactly which CIP or CIPS are bad. I would change all the plugs if you have over 60,000 miles on them. Additionally after you change the plugs your truck computer will have to "relearn" the firining order. The truck will run rough for about 3-4 restarts then it will run smooth. Getting the plugs changed took me 5 hours. Theres a lot of stuff in your way as you will see once you get started. The back 2 plugs on both sides are a real pain. Good luck !!
turn the ignition forward but do not start the truck. Then hit the gas padel to the floor 3 times, the light will flash and go out. It may take a couple times to get it right. If you still have any questions or need further assistance let me know. Thank you, Lee
Change oil every 3000 miles. Use 5w-30 weight.I would use syntetic oil base. I found on mine it runs quiter and smoother, better for the car also in the long run Buy it at a local auto part store..do not go crazy on the brands if you will change oil every 3k miles. If you want to go longer get the Mobil-1 syntetic for the 15k miles..but do it yourself..you will save tons. Every 12k miles change the air filter, very easy. Undo the clips , there are four of them and pull out the old and place the new one..five minutes operation ( $12.00) you can do the oil yourself also..10 minutes ( $13 ) . Spark plugs and rotor and distributor cap change every 30k miles, along with the fuel filter. Every 60k , I would change the spark plug wires ( 85 dollars) seems expensive , but you will definetly see a big difference in starting up the car,idle speed and performance as a whole....worth every penny.Timing belt change every 60k miles..do not take a chance on this one...it could be expensive if it breaks...not expensive (30 dollar part) and relatively easy..but have a mechanic or someone you trust. While you are there change the other belt, power steering and alternator belt( i think ) .You do this the car will drive for 200k miles without any problems
If there is little or no vacuum going to the engine at time of start up that will cause the engine to be hard starting, what it does is since theres not much vacuum if dumps crazy amounts of fuel into the cylinders to aid in starting, also would cause it to run funky for a few seconds after its started