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Possible that you could have put the distributor in 180 degrees out. Bring #1 piston up to top dead center with timing marks together on the harmonic balancer at crankshaft and pull the distributor cap off to see where the rotor is pointing. Should be pointing to #1 plug wire on cap.
you need to find your # 1cylinder you can do this by aliening the timing marks on back of bottom pulley (harmonic balancer) usually #1 is toward front take the spark plug out and carefully insert like wire or sewer driver to verify piston is all the way up thats TDC (top dead center) now locate # 1 plug wire mark the cap and distributor with marker remove cap install distributor so the rotor is pointing at # 1 find out your firing order you can bump the starter to know the rotation.
Set the engine to the number one compression,and bring the timing mark to zero on the harmonic balancer.(or just bring the timing on the harmonic to zero). mark to match the plug wires to cap,remove the cap.(if you can remove the cap without removing plug wire) mark the rotor position to the engine using a scribe, mark the rotor to the distributor, mark the distributor to the engine using a scribe,Take the lock down bolt out and pull out distributor. when you reinstall line up all your marking and check timing.
You could try this. It works on the previous generation Chevy trucks but I'm sure the oil pan still has the same shape. First, undo the distributor cap and lift it up from the disributor. You don't have to unplug wires but it needs to be able to move some. Then remove the 2 long bolts from the engine mounts. With them out GENTLY jack on the bottom pulley or harmonic balancer. The motor should lift just enough to slide the oilpan out. If you don't want to use the harmonic balancer, you could put a block of wood on the oilpan and jack from there. You'll have to block the engine up once it's lifted as high as you can. Use some blocks at the engine mounts to hold it. You could also lift the front of the engine with a set of chainfalls or engine hoist. The engine will have to go up until the distributor fetchs up on the firewall, that's why the cap has to come off. Hope this helps.
Hi: Sounds like your coil is Bad.Try replacing the Coil Wire 1st.If that does'nt work then I recommend that you Replace your Coil ,Spark Plug Wires,And Distributor Cap And Rotor and Spark Plugs Not knowing when you have tuned your Blazer up last. Look in where the Coil wwire goes to See if you see any Corrosion,Also Check the Coil Wire For Corrosion.Before you Buy all the Tune-Up its I mentioned Above. Your Coil is located inside your Distributor Cap on The Top inside your Distributor Cap Its Secured with 4-Small Bolts.
While you Have Your Distributor Cap Off Inspect the 6 or 8 depending if you have a V-6 or a V-8,To see if they have Corrosion and the Rotor as well. If replacing ALL for a Routine Maintenence which should really be done around 20,000-25,000 Miles Unless you Have Problems Before That Time Line.Make Sure to Inspect ALL of your Wiring Connections.You'll Need to Set your Timing It could vary a litle depending on what engine you Have.Get Specs.In your Maintenece Manual. Use a timing Light Don't Guess. Set your Timing around 4-8 Degrees before Top Dead Center (BTDC) You'll need to Clean Off The Bottom Pulley which is your Harmonic Balancer.Use Engine Degreaser so you can see the Marks on the Damper,Also you'll see a Pointer pointing to Your Bottom Pulley or Harmonic Balancer which is the Same pulley.Mark it with Either a Soap Stick at the 4-8 Degree (BDTC) Also mark The Pointer.Loosen Distributor Hold Down Clamp under your Distributor Bolted to Your Intake Manifold.Just Loosen it Enough to Turn but still have some Resistance and after you have Moved The Distributo Clockwise or Counter Clockwise until you Have Lined Up the Marks you Made on The Harmonic Balancer. Then Be Sure Not to forget to Tighten Your Distributor Hold Down Bracket.Otherwise it will Work its self Back out of Time.Once you have Followed my Solution you Should be Good to Go.Please Let Me Know How my Solution Worked out.I'm Almost 100% sure you'll be Satisfied and you'll have a Even Better Running Vehicle. from d_hubbs at FIXYA