I have a 1999 gmc Suburban that shudders on take off and up hills. I have replaced the intake and distributor, any ideas?

when you replaced the intake gaskets you over tightened the bolts and cracked the plastic on the new gaskets or cracked them replacing the intake on the engine or the bolts needed to be replaced cause they were stretched or the wrong gaskets where sold to you and you have a vacuum leak these are the most common causes of the problem you are explaining the newer intake gaskets are very sensitive to over tightening you really have to be carefull and follow the tightening sequence and torque specs

That is a cam to crank position correlation code. I understand you can adjust it by turning the distributor until the value is right. You need a scan tool to see the value and check it each time you adjust the distributor.

You may not have sealed the manifold correctly,mistakes like using the rear and front rubber seals can cause this instead of a bead of silicone. To check for intake leaks spray carb spray along the intake gasket to see if the engine changes tone or idle speeds, if it does you have a leak,.

you could have a bad engine coolant sensor. or if the check engine light is on get it scanned for the problem code. most auto parts stores will scan for free, if check engine light stays on.

This is torque converter shudder. Install Dr. Tranny's Shudder FIx Amazon com Lubegard 19610 Dr Tranny Instant Shudder Fixx 2 oz Automotive

It sounds like the choke is the most likely culprit. Take the air cleaner off the throttle body/Carburater. Have someone cover most of the throttle body/Carburater intake, if you don't have help use a piece of heavy cardboard. If it starts up right away it's the choke. Note: if you use cardboard don't rev the engine you may **** the cardboard into the engine.
I'm afraid with all the different types of choke controls I can't tell you how to fix your choke with out actually seeing it.

I WOULD change cap and rotor probably due to be replaced any way. is it bucking kinda? or a shudder? could be a transmission issue

Hi, the manifold absolute pressure (M.A.P) sensor is located on the intake manifold. I am not familiar with the GMC vehicles as I am in South Africa. The M.A.P sensor is usually situated on the top of the intake manifold furthest from the air intake/ throttle body. I hope this info will help.

I was factory trained to work on these cars, the problems i found for this symptom where this, a cracked air intake rubber flex hose, crack is on bottom and opens up when u accelerate, next is a defective MAF, which is a Mass Airflow sensor, neither of these two problems will set a code.

BEFORE YOU REMOVE DISTRIBUTOR,MARK THE POSITION OF #1 DISTRIBUTOR CAP TOWER TO DISTRIBUTOR..REMOVE CAP AND TURN ENGINE TO LINE UP ROTOR BUTTON WITH THIS MARK..MARK DISTRIBUTOR HOUSING IN RELATION TO HOLD DOWN CLAMP OR BOLT..YOU CAN USE A PAINT PEN OR EVEN SOME WHITE OUT..YOUR TIMING SHOULD BE CLOSE TO WHRE TO WHERE IT WAS..I HOPE THIS HELPS