lacking engine performance 1984 vette
Thread Starter
Heel & Toe
Joined: Feb 2016
Posts: 17
Likes: 0
lacking engine performance 1984 vette
Hey guys im curious as to why my 84 cfi lacks some power Ive tried finding what the idle should be at... dont know, also I plan on adjusting my rockers, and I need the car running to drive to work so I popped some spark plugs in I didnt gap them I didnt know.if I had too because ive heard some plugs come gapped but any suggestions as to why im missing power sometimes ill floor it and the car just wont go like it should and sometimes ill floor it and ill go flying so any suggestions as to what they problem may be would help thanks 
Safety Car
Joined: Sep 2004
Posts: 3,953
Likes: 550
From: Mission Viejo CA
How long have you owned the car? Is this a new problem? Does the engine start and idle okay? There could be several causes for your poor performance, but my first guess would be a dirty fuel filter. Has it been changed recently?
Can you show us a picture of the tips of the spark plugs you removed from the engine?
Can you show us a picture of the tips of the spark plugs you removed from the engine?
Burning Brakes
Joined: Apr 2016
Posts: 781
Likes: 73
Agree it could be clogged fuel filter. Could also be a failing fuel pump, dirty injectors or a dozen other things.
As a rule of thumb you should always check the plug gap on new plugs.
As already asked, is this a new car to you and is it a new problem.
As a rule of thumb you should always check the plug gap on new plugs.
As already asked, is this a new car to you and is it a new problem.
Drifting
Joined: Mar 2012
Posts: 1,492
Likes: 61
From: New Jersey
Far too little information - how many miles; how many miles since last tune-up; last tune-up- what was replaced; new gas or sitting with old gas for a long time; etc.
As a potential answer, make sure the following is either new, in good condition or replaced:
1. Pull spark plugs and properly gap them (NEVER install spark plugs without checking gap/gapping them);
2. Spark plug wires;
3. Distributor cap and rotor;
4. Coil;
5. Gas filter;
6. fuel pressure/two fuel injectors;
7. vacuum lines;
8. Air filter.
If it is going to be a daily driver, there is a lot more to be checked/inspected/serviced but that is up to you.
As a potential answer, make sure the following is either new, in good condition or replaced:
1. Pull spark plugs and properly gap them (NEVER install spark plugs without checking gap/gapping them);
2. Spark plug wires;
3. Distributor cap and rotor;
4. Coil;
5. Gas filter;
6. fuel pressure/two fuel injectors;
7. vacuum lines;
8. Air filter.
If it is going to be a daily driver, there is a lot more to be checked/inspected/serviced but that is up to you.
Last edited by Silver96ce; May 2, 2016 at 05:06 PM.
Thread Starter
Heel & Toe
Joined: Feb 2016
Posts: 17
Likes: 0
The car has been driven for a few months I dont feel the rough idle everybody talks about I have an 85 fuel filter in I put before started driving the plugs were new they came out of my friends 68 elcamino but the car was sitting for twelves years never started it was alot of work getting her going but she runs good I didnt replace the spark plug wires I didnt get the timing done im going to fix valve cover leak it may have an exhaust leak but shes a good car engines strong also I dont know if injectors are going bad or not but ive put cleaner in and gas is coming out crystal clear
Last edited by alcali; May 2, 2016 at 07:26 PM.
