I have a 2000 blazer 4.3 vortec 2wd 4dr i have had a hesistation issue that always starts on the intial start of driving and hesitates until operating temp i have changed plug wires cap rotor has the new fuel injectors that replace the old spider also new map tps cleaned the egr new gaskets for valve covers and upper and lower intake gaskets cleaned throttle body and replaced ignition coil habent performed a fuel pressure test and i will recheck spark plugs but if everything is in check i have no clue what to do

 

We can help you stop guessing!

Start by getting or borrowing a capable scanner (one that will read cmp retard). If you have Android I recommend Car Gauge Pro (for 1998+ Blazers only) + BAFX Bluetooth OBD2 adapter from Amazon. Total cost about $30.

If you have Iphone, then Dash Command ($10) + Enhanced GM PIDs ($10 more) for your year vehicle and take your pick of Wifi OBD2 adapters (I have no recommendation) but cheap is generally slow.

If you have 1996-1997 Blazer - then Dash Command is the only inexpensive game in town that I am aware of - they make it for both Android and Iphone but you will need to buy enhanced GM PIDs for each year vehicle.

1995 OBD2 is not supported by any inexpensive scanner I am aware of.

You may find you will need a digital multimeter, so locate one of them.

Also read the sticky on fuel pressure testing at the top of the 2nd gen forum. Go get a loaner fuel pressure gauge from a local auto parts store like Auto Zone or Advance Auto parts.

Then come back and we can get started with diagnosis and verification of correct operation of a number of things.

 

My 99 Blazer does the same thing. I recently bought it and Im getting ready to go through it. I will let you know if/when I find a solution.