350 tbi stumbles and backfires under load

[lctopal]

If timing is good you have most likely a fuel issue. Could be ignition or a vacuum leak too

I checked the fuel pressure it’s between 11-12psi which should good I have went over the vacuum system with some slap shot and just visual and found no cracks or leaks, I would I be right o go into the throttle body next?

 

[Radiohead]

IIRC, one should be able to see the fuel spray in real time to a point. A timing light can help. Watch for drips too.

 

[Ricko1966]

IIRC, one should be able to see the fuel spray in real time to a point. A timing light can help. Watch for drips too.

Yes you can use inductive timing light to check injector pattern,clip the pickup to the coil wire,not the number 1 wire. I wasn't going to mention this until he's done basic diag, but that's how you do it. The TPS will make them stumble also,but basics need checked first. IMHO

 

[lctopal]

Yes you can use inductive timing light to check injector pattern,clip the pickup to the coil wire,not the number 1 wire. I wasn't going to mention this until he's done basic diag, but that's how you do it. The TPS will make them stumble also,but basics need checked first. IMHO

Yeah I got to far ahead of myself and it turned out to be the coil will have to remember that for last time

 

[Rusty Nail]

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[fivezero]

Redacted. Didn't see the coil was at fault.

 

[hikertrash87c10]

I was having the exact same issues, i went with the delco ignition module, plugs, wires, O2, etc... I ended up getting convinced to go the holly sniper route. it should be done by next week and ill report back. FYI instead of the expensive scanner you can jumper i believe the A&B port with a paperclip for the system to flash all engine codes.