Question about 1988 GMC G2500

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Hesitation on gas pedal

I had a tune up and $3200 of heater core and a load of other stuff done to the front end just 2 weeks ago. My van still hesitates and doesn't give immediate response when I put my foot on the gas to leave a light or even to quickly accelerate. What do you think it is and how do I approach the repair people. Thanks bunches

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Get the fuel pressure checked. Also replace the fuel filter if not done yet. Clean the throttle body with carb cleaner. I don't know exactly what they tuned up or whatever but the fuel filter should've been part of it. Write back if you need more.

Posted on Jun 25, 2009


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2000 alero gas pedal hesitation as well as shut off when slowing or stopping

Usually the problem of hesitation is caused by a faulty throttle position sensor or low fuel pressure, and stalling is a dirty throttle body or faulty idle air control valve.
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My 1996 Mazda 626's check engine light has been on for a little while and about 2 weeks ago whether it was idling it ran really rough and was missing out. Also when I step on the gas pedal or stop at a...

Some things to check first:
- When was the last time this car had a tune-up? Could be as simple as that.
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I have no interior heat. Boiled over 2 weeks ago. had rad flushed and all new antifreeze. Worked for 1 week and then no heat at all. Replaced thermostat. Still no heat although all hoses are hot.

there is two things. one is low coolant the other and most likely is heater core is plugged flushing the coolant causes things to loosen up stuff and it gets stuck in the heater core if you take heater hoses off and back flush the heater core with a garden hose and you will have better heat then you ever had.

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How do i replace heater core

I believe on a 1987 chevy van the heater core should be under the black plastic cover on the firewall on the left hand side as you are standing in front of the van.
I believe you can also get to it under the passenger side dash.
It is NOT fun. Unless you are a seasoned mechanic, I would not attempt it.
Otherwise stop by your local auto center, and get a HAYNES manual, they will be able to show how to.

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When I press on the gas pedal there is hesitation. It feels like the vehicle is forcing to go forward.


Nov 29, 2009 | 1987 Plymouth Voyager

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Lag in acceleration, jerking, and no heat from the heater.

Try having heater core flushed and replace the heater control valve. As for the hesitation, that could be the 02 sensor needs to be replaced, or something may be clogged in the fuel system. my van is a 3.0. Had to replace fuel pump. Also when you've had work done like that the mechanic needs to reset computer, once that done it takes a while for it to run properly again. Hope this helps.

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1993 taurus heater core replacement guide

This is a big job which involves discharging and removing parts of the A/C system as well as removing parts of the dash. I had the core done on a 94 Sable years ago and it was a very labor intensive and expensive job. Here are some instructions I found for a 94 Taurus which should be the same thing or similiar, but I don't guarantee that. Please note that these instructions were not tested by me and may contain errors or be incomplete in some way. For example "remove instrument panel" sounds simple but in reality is a process in itself requiring the removal of many screws. Naturally you would have to recharge the A/C and refill the coolant when done.

1. Remove instrument panel and lay it on front seat.
2. Remove A/C evaporator housing as outlined.
3. Remove vacuum source line from heater dash panel seal (18529).
4. Remove heater dash panel seal from heater core tubes (refer to Heater Case Assembly).
5. Remove four heater core access cover retaining screws and remove heater core cover (18B300) from A/C evaporator housing.
6. Lift heater core and seals from A/C evaporator housing.

1. Transfer three foam core seals to new heater core.
2. Install heater core and seals into A/C evaporator housing.
3. Position heater core cover on A/C evaporator housing. Install four retaining screws.
4. Install heater dash panel seal on heater core tubes.
5. Install vacuum source line through heater dash panel seal.
6. Install A/C evaporator housing into vehicle as outlined.
7. Reinstall dashboard components.

Best of Luck!


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May be only a check valve. Be sure your man knows ABS stuff. It CAN get tricky....accordianman

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If you look down by the gas pedal you will see two tubes coming out of the heater box, that is where the heater core is. To replace the heater core you need to disconnect the heater hoses from the heater core in the engine compartment. Then remove the gas pedal from the floor, and disconnect the brake booster rod from the brake pedal. Next you will need to disconnect the shaft going to the bottom of the steering column. (Make sure not to turn the steering wheel while the column is disconnected or you may damage the clock spring). After all of that is disconnected you will have to remove a cover for the heater core tubes. Then remove the tubes from the heater core. There are a couple of screws that hold the core in. Remove those screws and the heater core will slide out of the heater box.
This is not as difficult as it sounds. Just make sure and not turn the steering wheel, and top off the coolant when you get done.
Good Luck.

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