I GOT A 95 CHEVY TRUCK WITH A TBI 350 THAT RUNS LIKE CRAP AT IDLE UP TO ABOUT 2000RPMS IVE CHANGED THE FUEL FILTER PLUGS WIRES CAP AND ROTOR THERES NO CODES IN THE COMPUTER AND THE FUEL PRESSURE IS SPOT ON I CHECKED THE TIMING AND IT IS 10 DEGREES ADVANTANCE WITH THE BROWN AND TAN WIRE UNPLUGED AND THE TRUCK WILL NOT STAY RUNNING WITH ANY LESS IT JUST SURGES UP AND DOWN AND DIES SOMETIMES WHEN U PUT IT IN GEAR ANY HELP WOULD BE APPRECIATED
NEED HELP 350TBI
- Thread starter slim69
- Start date
Checked your EGR valve, IAC valve, and TPS sensor? TPS is on the throttle body, IAC is in the throttle body, and the EGR... I think that may look a little different than the older ones.
IAC
TPS
EGR
A faulty EGR valve can either stick open or have a broken internal spring, causing a severe miss/crappy idle, possibly the same with the IAC (but I don't think it would leak that bad), TPS is just a thought, not very likely.
IAC
TPS
EGR
A faulty EGR valve can either stick open or have a broken internal spring, causing a severe miss/crappy idle, possibly the same with the IAC (but I don't think it would leak that bad), TPS is just a thought, not very likely.
Also double check the throttle body to manifold gasket, those are VERY common to start leaking vacuum and the computer doesnt know what to do. My guess in order would be IAC, T-body gasket, EGR valve, then TPS. BUT dont just start guessing!
allso try the plug on the thermistat dont know the nameof it but mine broke off and the engin ran like dog blank
The coolant temp sensor is what he means.
It will go real rich if the sensor is unplugged (reading -40)
That won't help things if its not working.
A datalog could indicate what is happening. If you have a laptop and a cheap cable to read it with.
Check for any codes too to be sure there isn't an obvious problem.
It will go real rich if the sensor is unplugged (reading -40)
That won't help things if its not working.
A datalog could indicate what is happening. If you have a laptop and a cheap cable to read it with.
Check for any codes too to be sure there isn't an obvious problem.
havent had time to mess with it been busy in the shop its been crazy but will get too it soon thanks for the help guys!!!! 
new fuel pump,temp sending unit, ignition control module, egr, iac, tps andd still runs like crap any ideas
I know it seems a bit basic (& Streetbu mentioned it), but have you tried spraying a liquid any place there may be a vacuum leak (any gaskets, etc.)? Have you actually watched the injectors to see if they're firing correctly? How are all your vacuum hoses?
