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i got this s-10 real nice truck the guy took out the 2.8 carb and installed a 1994 vortec 4.3 and tranny,.he could never get it to stay running keeps bblowing ecm fuse... he installed the 4.3 wire harness and comp. it will start and run until u let go of start position on ignition. he also replaced the ignition trying to fix that with no avail.... does the fuse box need replaced also? he also put in bigger fuel pump. just need to know maybe a ground problem? help
 

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i saw what you did there!
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sounds like no 12 volts to the coil when its in run position

hard to say without seeing it

and it will need fuel pump for vin W engine. if it doesnt have enough pressure for that style fuel injection then it will be difficult to start and wont run right

should be somewhere in the mid 50's PSI

ECM fuse blowing isnt good at all

need that circuit to be working to feed the computer 12 volts, or it wont run

if you have to then run 12 volts off run position wire of the ign switch to the 12 volts wire of the ECM connector
 
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