Rough idle hesitation
 

Hello I am a newbie picked up an 84 for my son and I and it idles rough and hesitates on acceleration, changed plugs, wires, distributor cap & rotor, coil, fuel pump any help would surely be appreciated!

RE: Rough idle hesitation
 

Have you checked to see if both throttle body injectors are squirting gas? Any trouble codes, check engine light?

RE: Rough idle hesitation
 

Yep both spitting fuel and no codes at least no check engine light as stated I am new to the vette arena but learning. How do I get the stored codes if I have no idiot light?

RE: Rough idle hesitation
 

Short the 2 terminals together on the diagnostic connector in the upper right hand corner, then turn the key on and count the flashes of the CE light. Each code will blink 3 times, pay no attention to code 12 at first. Have you checked to see if the coil wire is good?

RE: Rough idle hesitation
 

No codes! Really has me puzzled with no code it is a shot in the dark I can't find a vacuum leak maybe fuel pump? EGR?

RE: Rough idle hesitation
 

Maybe the temp. sender on the intake that tells the computer how warm the engine is running . Had same symtoms on a truck w/ same no codes. The engine ran too rich and floods out causing the cats. to pull up. Changed the sender and the corroded plug and the engine ran good.

RE: Rough idle hesitation
 

Have you checked engine vacuum @ idle, and checked compression? Get a pair of plastic pliers and pull plug wires one at a time @ idle to try and isolate which cylinders are missing.

RE: Rough idle hesitation
 

Well I went and changed the Fuel Pump what a difference not perfect but it sure isn't bad for a 24 year old car! Thanks to all those who tried to help it is appreciated. I am sure I will have more questions as I learn!