i have a newly rebuilt 351w bored 40 over 500 lift comp cam fires up run great when on gas at idle she stoles or rpm are going up and down


Asked by Jan 11, 2016 at 08:22 AM about the 1984 Ford Mustang GT Hatchback

Question type: General

ford 351w,          stock heads new valve spring for the cam, ported, valve seat were opened up , rpm intake, holly 600  4 barrel carb, roller rocker arms, 6 to 8 psi 80 gph fuel pump, stander tranny what could be the problem

2 Answers


Is there a vacuum advance on there? Are you using the old ECM or bypass it all?


New carburetor?

Your Answer

Add photo

Related Questions

  • 64.5 mustang with 260V8? 43 answers

    I have a 64.5, and it has the Original 260 V8. I pulled the heads off, to replace it with some 351W 1969 DO0E Heads,the top of the pistons are stamped 0.40. It was rebuilt 3K miles ago, from the first...

    1964 Ford Mustang Standard Coupe



  • Gas mileage 11 answers

    I have a 1984 mustang lx convertible and I'm getting about 80-90 miles on a 14 gallon tank. Now that's shitty. It is a 3.8 v6 automatic. I really REALLY want to get rid of the car because of it. When...

    1984 Ford Mustang LX



  • How many 1964 1/2 Mustangs were made? 99 answers

    I would like to know how many 1964 1/2 Mustangs were made and how many of them were convertibles.

    1964 Ford Mustang



  • Fastest 1/4 mile time?! 16 answers

    I just want to know what is the fastest someone has ran with a 1997 GT mustang that is stock. I have put on a custom exhaust system and I ran 14.6

    1997 Ford Mustang GT Coupe



  • Idle 4 answers

    Stock 02 mustang gt great car had it for a long time .. but now if it sets for 12 or more hours when it's time to go for a ride she has a high idle 1500 RPM drive it to my stop sine everyday and c...

    2002 Ford Mustang GT Convertible


    Maintenance & Repair

Search Ford Mustang Questions

Ford Mustang Experts

#1 Tom Demyan
Tom Demyan
Reputation 3,770
#2 FordNut
Reputation 1,220
#3 carGrrl
Reputation 890
View All

Related Models For Sale

Used Chevrolet Camaro"
798 Great Deals out of 38,822 listings starting at $2,650
Used Dodge Challenger"
436 Great Deals out of 25,366 listings starting at $7,980
Used Dodge Charger"
646 Great Deals out of 29,672 listings starting at $2,275
Used Chevrolet Corvette"
434 Great Deals out of 20,224 listings starting at $3,688
Used Ford F-150"
3,267 Great Deals out of 216,697 listings starting at $1,500
Used BMW 3 Series"
1,607 Great Deals out of 39,619 listings starting at $888
Used Honda Accord"
1,258 Great Deals out of 78,695 listings starting at $1,400

Used Cars For Sale

2017 Ford Mustang For Sale
12,265 listings starting at $21,495
2016 Ford Mustang For Sale
51 Great Deals out of 7,535 listings starting at $17,899
2015 Ford Mustang For Sale
185 Great Deals out of 4,139 listings starting at $15,999
2014 Ford Mustang For Sale
104 Great Deals out of 2,885 listings starting at $11,950
2013 Ford Mustang For Sale
43 Great Deals out of 1,423 listings starting at $9,999