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My suburban will start runs rough but dies when tring to accelerate found a cracked dist. cap 3 weeks ago replaced it truck ran desently. yesterday checked plug wires seem ok spark plugs cleaned and put back in checked fuel filter clear pulled gas tank it was free of debris and filter screen clear fuel pump is pumping truck when started acts like it is running out of gas
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First you need to retrace your steps...before you changed the timing chain and gears did It run ok ? what was initial problem, next put a fuel pressure gauge on your fuel line and cycle your key on to run pos, dont have to try start, just run and see if you have fuel press during the 3 sec or so pump cycles, should be around i think 35-45 roughly for tbi. so if you have good fuel pressure , then you say you have good spark, then your problem is either ingition or valve timing, did your dist.come loose, did you properly install chain & gears and align timing marks. did you have somethine else a part on it too like intake, dist, ? get back with me I'll try to help you.
The fuel pump should be in the 20s. Also it could be losing presure slowly. Leave the fuel pump pressure gage on for at least 2 to 3 hours to see if it is losing pressure - It's a start
Sounds alot like the ignition sensor. In my old Chevys it was under the dist cap, mounted on the dist itself. Mine was flat, slightly curved rectangle shape, with two flat prongs coming out both sides. If it would get an internal break in it, you cant see it. I would have the same problem as you, part was only about $12. And comes out with unscrewing two screws.
Might want to give it a shot.
think electrical 1st -the weakest link-bet u havnt had tuneup since yr 1000-inspect plug wires for wear n take off dist cap n look inside-scarry!--of course chec fuel system also in gas tank area
Try checking the spark plug, and the spark wires, if that doesnt clear things up then try replacing the roter under the distributor cap and check the cap for any corrosen
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