My truck recently has been kinda jerking or shuddering when coming to a stop but if I put it in neutral or park it stops and goes back to normal idle. What are some things that are known to cause this? Thanks!

 

You probably have a vacuum leak somewhere or maybe your MAF sensor is bad. It probably won't hurt to clean throttle body and all out too. If you need me to explain in detail just let me know. I hope this helps you out.

 

Any help is appreciated, I am not experienced with this TBI platform haha.

 

Actually before I go into all this, are you throwing any codes? To check for a vacuum leak, grab some brake cleaner, throttle bottle cleaner, or anything of that nature. Simply take that spray and spray all over vacuum lines and around intake manifold while the motor is running. What you want to pay attention to is any idle change (bog down or high idle) and if that happens, then you have found your vacuum leak. To clean the TBI, just open the butter fly and spray your cleaner and take a tooth brush and clean as best as you can with toothbrush and a rag. If you find that your problem persists, then I would start looking into distributor/ fuel related problems. Once again, if you need something else or you are confused about something let us know.

 

Could it possibly be something in the drivetrain? I would hope not for the sake of my wallet haha. The only other things I can think of personally is IAC or Distributor. It isn't throwing codes, I replaced the spark plugs today in hope of a fix but hasn't changed.

 

I most definitely could be your distributor. They get old and get moisture and rust inside them and could definitely throw your motor off and make it have a sputter

 

So far cleaned up the IAC, spark plugs, made sure TB is clean, air filter. Next thing I can think of is TPS...any more ideas?

 

Yeah man check that distributor cap and check for vacuum leak

 

The link below has helped me troubleshoot TBI you can save the document in PDF format.

http://www.73-87chevytrucks.com/tech...TBISystems.pdf